Hypermiling Auto Trans w/ Tach
Looking for other people's experiences on hypermiling an auto tranny with tach.
My '89 tranny does NOT have a lockup torque converter so I've been observing a certain amount of t/c slip.
Anyway, it seems I can keep the tach at say 2000 to 2300 rpm and that is a pretty effective way of maintaining a steady load on both engine and tranny. I've been doing this for a couple weeks now. Today I logged my best mpg so far, 28.5 in a car with EPA highway rating of 24. I kept the tach real close to 2000 rpm for the 2nd 60 miles of this 120 mile fillup. First 60 miles was a more aggressive P&G on hills with downhill speeds up to 70.
Without a lockup t/c, opening the throttle has the RPMs increasing fairly quickly while mph goes up much more slowly. Eventually the mph stabilizes at whatever speed the throttle position will support based on grade, load, etc.
Currently getting +/- 50 mpg in fall weather. EPA is 31/39 so not too shabby. WAI, fuel cutoff switch, full belly pan, smooth wheel covers.
Now driving '97 Civic HX; tires ~ 50 psi. '89 Volvo 240 = semi-retired.