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04-30-2006, 12:54 PM
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#1
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New Member
Join Date: Feb 2006
Posts: 22
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umm, hows this possible?
Today at a local gas station, I heard it was only 2.85 for 87 so I jumped at the chance  and I only had 112.2 miles on the tank, but I thought why not fill up anyways. Well, I only got 1.633 gallons in :? Which means 68.7 mpg... :jawdrop: how is this possible? Is it off because I didn't drive far? The nozzle kept clicking off, I must have tried filling up about 5 more times but it would put about 20 more cents in and stop again. Whats the deal? :O |
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04-30-2006, 12:59 PM
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#2
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Driving on E
Join Date: Sep 2005
Location: Salt Lake City, UT
Posts: 3,993
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Re: umm, hows this possible?
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Originally Posted by Danno
Today at a local gas station, I heard it was only 2.85 for 87 so I jumped at the chance and I only had 112.2 miles on the tank, but I thought why not fill up anyways. Well, I only got 1.633 gallons in :? Which means 68.7 mpg... :jawdrop: how is this possible? Is it off because I didn't drive far? The nozzle kept clicking off, I must have tried filling up about 5 more times but it would put about 20 more cents in and stop again. Whats the deal? :O |
The "click method" is probably the most accurate way of measuring fuel if you:
1) use the same pump
2) don't fill anything less than 5 gallons.
I'm guessing it was a combination of both of these that made your MPG higher. |
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04-30-2006, 01:13 PM
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#3
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New Member
Join Date: Feb 2006
Posts: 22
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Same pump as always, just
Same pump as always, just heard it was cheaper today so I went lol :P
So its reading inaccurately is what you mean?
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04-30-2006, 01:16 PM
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#4
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*shrug*
Join Date: Sep 2005
Posts: 7,406
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It's prolly just pump error.
It's prolly just pump error. The fact that you had to make it click several times to do anything suggests that something was up with it.
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04-30-2006, 01:38 PM
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#5
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New Member
Join Date: Feb 2006
Posts: 22
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Oh ok, that it didnt put
Oh ok, that it didnt put enough fuel in. Crap, well looks like ill have to refill after a few miles again monday so that i can run a full tank and have it be completely accurate.
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04-30-2006, 01:42 PM
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#6
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Driving on E
Join Date: Sep 2005
Location: Salt Lake City, UT
Posts: 3,993
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Re: Oh ok, that it didnt put
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Originally Posted by Danno
Oh ok, that it didnt put enough fuel in. Crap, well looks like ill have to refill after a few miles again monday so that i can run a full tank and have it be completely accurate.
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It's possible that it put enough fuel in. The problem exists when you try to fill too little fuel.
For example, I could drive for 10 miles and then go to fill up. It would barely put anything in, which would give me a MUCH higher MPG than I am used to.
This is why I say to only count it if it is more than 5 gallons, as the law of averages usually leans more towards the actual MPG number. |
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04-30-2006, 02:02 PM
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#7
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New Member
Join Date: Feb 2006
Posts: 22
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cool. thanks
cool. thanks  |
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04-30-2006, 02:03 PM
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#8
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3 pedals>*
Join Date: Oct 2005
Posts: 2,024
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anything less than 5 gallons
anything less than 5 gallons is bull****. That is why I erased all my 150 mile and below fill ups.
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04-30-2006, 02:38 PM
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#9
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New Member
Join Date: Feb 2006
Posts: 22
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ill erase it from my gaslogs
ill erase it from my gaslogs when my mpg goes up :P just so I can feel better |
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04-30-2006, 02:47 PM
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#10
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3 pedals>*
Join Date: Oct 2005
Posts: 2,024
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Re: ill erase it from my gaslogs
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Originally Posted by Danno
ill erase it from my gaslogs when my mpg goes up :P just so I can feel better |
FYI I had the same MPG as you, even better. If I erase my racing tank I'll go into 29mpg. I haven't been really trying to get my mpg up like the rest of the people. If I really wanted I'd be in the 30's now.
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04-30-2006, 03:02 PM
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#11
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3 pedals>*
Join Date: Oct 2005
Posts: 2,024
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See, now I'm the same with
See, now I'm the same with you. Because I erased the 2 tanks where i was speeding like crazy my mpg went up .5mpg
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04-30-2006, 03:15 PM
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#12
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Driving on E
Join Date: Sep 2005
Location: Salt Lake City, UT
Posts: 3,993
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I'm unsure what good erasing
I'm unsure what good erasing the gaslog entries will do. In the long run it will all work out anyway, especially since the next fill up will average out the previous one.
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04-30-2006, 03:24 PM
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#13
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3 pedals>*
Join Date: Oct 2005
Posts: 2,024
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Re: I'm unsure what good erasing
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Originally Posted by Matt Timion
I'm unsure what good erasing the gaslog entries will do. In the long run it will all work out anyway, especially since the next fill up will average out the previous one.
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He used the pump error to boost his mileage. I used to do it too but the only person you screw is yourself
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04-30-2006, 03:38 PM
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#14
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Driving on E
Join Date: Sep 2005
Location: Salt Lake City, UT
Posts: 3,993
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Re: I'm unsure what good erasing
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Originally Posted by Compaq888
Quote:
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Originally Posted by Matt Timion
I'm unsure what good erasing the gaslog entries will do. In the long run it will all work out anyway, especially since the next fill up will average out the previous one.
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He used the pump error to boost his mileage. I used to do it too but the only person you screw is yourself |
The pump error will work the opposite way the next time around though. It will average itself out. Assuming this is true removing the pump error will actually hurt your gas mileage. |
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04-30-2006, 04:21 PM
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#15
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3 pedals>*
Join Date: Oct 2005
Posts: 2,024
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Re: I'm unsure what good erasing
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Originally Posted by Matt Timion
Quote:
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Originally Posted by Compaq888
Quote:
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Originally Posted by Matt Timion
I'm unsure what good erasing the gaslog entries will do. In the long run it will all work out anyway, especially since the next fill up will average out the previous one.
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He used the pump error to boost his mileage. I used to do it too but the only person you screw is yourself |
The pump error will work the opposite way the next time around though. It will average itself out. Assuming this is true removing the pump error will actually hurt your gas mileage. |
so that time I got 43mpg twice wasn't pump error???
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04-30-2006, 04:31 PM
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#16
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*shrug*
Join Date: Sep 2005
Posts: 7,406
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I think if you compare a .3
I think if you compare a .3 gallon fill up to a 10 gallon fill up, those two together will get rid of most of the pump error.
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04-30-2006, 06:10 PM
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#17
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Driving on E
Join Date: Sep 2005
Location: Salt Lake City, UT
Posts: 3,993
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Re: I'm unsure what good erasing
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Originally Posted by Compaq888
Quote:
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Originally Posted by Matt Timion
The pump error will work the opposite way the next time around though. It will average itself out. Assuming this is true removing the pump error will actually hurt your gas mileage.
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so that time I got 43mpg twice wasn't pump error??? |
I never said it wasn't a pump error. I said that the next fill up will average out the error.
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04-30-2006, 07:06 PM
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#18
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I should be WORKING now
Join Date: Dec 2005
Location: Eastern Ontario
Posts: 4,791
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another factor to consider
another factor to consider at this time of year is thermal expansion in the fuel (cool nights, warm days - at least around here). it'll be particularly apparent when you try to fill an already full tank if the fuel has expanded at fill-up time.
if you want to calc the actual temperature/volume differences, go here for info: i used to have a figure handy (x% vol. change for every n degrees change, but i've forgotten).
http://www.users.qwest.net/~taaaz/AZgas.html#HOW%20GASOLINE%20IS%20SOLD%20IN%20CANAD A
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04-30-2006, 07:30 PM
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#19
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Flying Under the Radar
Join Date: Feb 2006
Location: Raliegh, NC
Posts: 1,694
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Re: See, now I'm the same with
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Originally Posted by Compaq888
See, now I'm the same with you. Because I erased the 2 tanks where i was speeding like crazy my mpg went up .5mpg
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OK, so does than mean that everyone can erase thier two worst tanks?
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04-30-2006, 07:37 PM
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#20
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*shrug*
Join Date: Sep 2005
Posts: 7,406
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Quote:OK, so does than mean
Quote:
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OK, so does than mean that everyone can erase thier two worst tanks?
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Certainly not. |
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04-30-2006, 07:42 PM
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#21
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Flying Under the Radar
Join Date: Feb 2006
Location: Raliegh, NC
Posts: 1,694
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Re: Quote:OK, so does than mean
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Originally Posted by SVOboy
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OK, so does than mean that everyone can erase thier two worst tanks?
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Certainly not. |
Agreed. It is what it is. Otherwise, what's the point?
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04-30-2006, 07:45 PM
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#22
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*shrug*
Join Date: Sep 2005
Posts: 7,406
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Quote:Agreed. It is what it
Quote:
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Agreed. It is what it is. Otherwise, what's the point?
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I'm not sure. |
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04-30-2006, 08:02 PM
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#23
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I should be WORKING now
Join Date: Dec 2005
Location: Eastern Ontario
Posts: 4,791
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Re: See, now I'm the same with
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Originally Posted by krousdb
OK, so does than mean that everyone can erase thier two worst tanks?
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soon it won't matter. when matty mods the gas log / sig image to show the previous 3 months as your "current average", all will be good.
that's when i'll add the img to my sig
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04-30-2006, 08:10 PM
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#24
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Member
Join Date: Mar 2006
Posts: 202
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If you ever have a "funky"
If you ever have a "funky" tank and suspect the calculated results to be erroneous, I think the best thing to do is average it in with your next tank. So you take the miles and gallons from this short, possibly wrong tank and add them to the miles and gallons of your next, presumably longer and more accurate tank. Your lifetime average will work out exactly the same but you won't have the spike on the graph.
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'07 Toyota Prius
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04-30-2006, 08:46 PM
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#25
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I should be WORKING now
Join Date: Dec 2005
Location: Eastern Ontario
Posts: 4,791
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that's a good idea, brick.
that's a good idea, brick.
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04-30-2006, 09:01 PM
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#26
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3 pedals>*
Join Date: Oct 2005
Posts: 2,024
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Re: See, now I'm the same with
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Originally Posted by krousdb
Quote:
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Originally Posted by Compaq888
See, now I'm the same with you. Because I erased the 2 tanks where i was speeding like crazy my mpg went up .5mpg
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OK, so does than mean that everyone can erase thier two worst tanks?
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No, I was just proving a point. My mpg went back up to 28.2
Don't worry I put the 2 tanks back. it's down to 27.8mpg. It wouldn't be fair for me to erase all my bad tanks.
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04-30-2006, 09:18 PM
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#27
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Senior Member
Join Date: Jan 2006
Location: Newport RI USA
Posts: 2,434
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why so high
Why so high well think about it - the gas came out of the ground and got warmed up in your tank and expanded. This prevents you from putting more gas in the tank. If you drove the entire tank you would get the same mileage because the total energy is the same it just tankes up more room than usual. So maybe you expanded a half a gallon or more in the total tank but that keeps you from putting more in. If you filled the tank and it expanded a half gallon and you drove it and burned half a gallon it would still be a full tank.
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