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Diesels Discuss your diesel vehicle and how to save on fuel.

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Old 04-11-2007, 04:06 PM   #1
Sludgy
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Talking Starting a pool.......

I started a mpg test of my 6.0 diesel/automatic regular cab 4x4 F350 today. Here are the mods:

235/85 16 tires, broken in about 500 miles, replacing 265/75 16.
Radiator grill block (fabric)
Bed cover (plywood)
Removed spare tire from beneath truck and put in truck bed.
Relocated trailer harness out of airstream.

I'm driving several hundred miles on the highway in the next few days. I plan to obey the speed limits, mostly 65 mph. Just to see who pays attention to my posts, I'll send a crisp $10 bill to the person who guesses my mileage most closely. In case of a tie, the first person to post a guess wins.
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Old 04-11-2007, 04:24 PM   #2
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21.2 mpg!
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I think if i could get that type of FE i would have no problem driving a dildo shaped car.
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Old 04-11-2007, 04:37 PM   #3
Bill in Houston
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19.8 mpg
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Old 04-11-2007, 04:46 PM   #4
Peakster
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65mph in a Ford F-350??? (granted it's a diesel) I'm going to go with 16.8 mpg... so prove me wrong Sludgy!
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Old 04-11-2007, 07:05 PM   #5
The Toecutter
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What will be the shape of the bed cover? Flat, rectangular, or tapered? This makes a huge difference.
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Old 04-11-2007, 07:43 PM   #6
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Exclamation

Quote:
Originally Posted by Sludgy View Post
...In case of a tie, the first person to post a guess wins.
omgwtfbyobbq is hoping for a tie as he's the "first person to post a guess". He can win if his guess is the closest or he can win if others tie for closest.
We know what you meant to write...
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Old 04-11-2007, 07:52 PM   #7
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17.6
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Old 04-11-2007, 08:02 PM   #8
SVOboy
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18.1
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Old 04-11-2007, 08:03 PM   #9
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Old 04-11-2007, 08:05 PM   #10
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I go for 18mpg.
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Old 04-11-2007, 08:28 PM   #11
Matt Timion
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15mpg. Is this like The Price is Right where you can't go over?
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Old 04-11-2007, 08:29 PM   #12
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I withdraw my guess! I forgot I don't believe in gambling...18.1 is back up for grabs.
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Old 04-11-2007, 08:38 PM   #13
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19.1 mpg!
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Old 04-11-2007, 08:45 PM   #14
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18.6

I bid 18.6mpg
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Old 04-11-2007, 08:59 PM   #15
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Old 04-11-2007, 09:25 PM   #16
kickflipjr
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20!

lets see if it can be done.
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Old 04-11-2007, 10:06 PM   #17
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OH by the way nice truck. This may make some people cry on this site but i love all the f series truck. My mom drives a new f 150 and i love it. Its really hard to get her or my dad (drives a new accord) to hypermile them tho. anyone know of ways to get them to gradually start hypermileing
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Old 04-12-2007, 07:50 AM   #18
Bill in Houston
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If we could arrange for gas to go up to, say, 2.70 per gallon, maybe they would be motivated. Oh, wait, that already happened...
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Old 04-12-2007, 08:24 AM   #19
smithenhiven
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21.3
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Old 04-12-2007, 09:31 AM   #20
davidjh72
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18.9
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Old 04-12-2007, 09:36 AM   #21
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Is it a dually? I say 16.5mpg.
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Old 04-12-2007, 09:55 AM   #22
CO ZX2
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22.2 I'm bettin' on Sludgy, not the truck.
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Old 04-12-2007, 02:11 PM   #23
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One ton, new engine not broken in, I think it's going to be . . . oh . . . say 16.2 mpg.

Sludgy, when you have the time, drain the front and rear differential fluids (only do the front after you've driven it in 4wd a bit) and replace with synthetic. There's a lot of metal floating around in there from the gears breaking in and you won't believe what comes out, particularly the rear.

Also replace the tranny filter if you haven't already.
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Old 04-12-2007, 02:52 PM   #24
Bill in Houston
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I'm counting on Sludgy's skill and the skinny tires.
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Old 04-12-2007, 03:05 PM   #25
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29.8 picoacres.

(That works out pretty close to 19.5mpg)

Last edited by kps : 04-12-2007 at 04:05 PM.
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Old 04-12-2007, 03:16 PM   #26
Sludgy
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Answers and hints:

The truck bed cover is made from 1/4" luaun plywood; it's flat, not tapered or boxed.

The closest guess is the winner, whether high or low.

The rear wheels are single.

I plan on adjusting the odometer mileage for tire diameter, as published in the Tire Rack tables.

I'm at ~320 miles thus far on this tank. Weather has been mostly good so far, except it sucked today on about 100 miles of the return trip from Holyoke, rainy with strong headwinds. I tucked in behind semis most of the way, but this weather has to have hurt mpg.

I'm making a 100 mile round trip to Haverhill tomorrow in better weather, after which I'll gas up at the same station.

However, I'm using the wife's car to go to NY this weekend, and may not have time to post the results and select the winner until Monday.
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Old 04-12-2007, 03:46 PM   #27
Sludgy
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Quote:
Originally Posted by SVOboy View Post
I withdraw my guess! I forgot I don't believe in gambling...18.1 is back up for grabs.
This isn't gambling, since YOU didn't bet any money. It's a contest, and you can pick a number!
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Old 04-12-2007, 04:03 PM   #28
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Quote:
Originally Posted by Sludgy View Post
This isn't gambling, since YOU didn't bet any money. It's a contest, and you can pick a number!
The conflict is profiting at the expense of another, (for me, at least)
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Old 04-12-2007, 04:38 PM   #29
Bill in Houston
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Quote:
Originally Posted by SVOboy View Post
The conflict is profiting at the expense of another, (for me, at least)
To me, Sludgy is giving a prize to the winner. I didn't pay to enter or anything like that. He is just being a swell guy and having fun with his new truck.

But, you gotta go with your conscience. I have rules that I put on myself when it comes to drinking that wouldn't make sense to many people, but they are what my conscience requires.
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Old 04-12-2007, 04:51 PM   #30
SVOboy
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Who drinks anyway, not me,

I'll go back in for 18.1 with the proceeds going to darfur if I win.
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