I've noticed that there's a maximum gas mileage in both automatics that I drive that around 42mph I can get 44 and 42 miles per gallon. This seems to be the lowest RPMs needed to not lose speed on flat ground at that speed, in the highest gear (4th).
What do you cars get?
Subary Legacy wagon - 44mpg
Chevy Venture van - 42mpg
EDIT: Just as clarification, I meant the highest for flat ground while on the accelerator, not the highest gas mileage using technique.
Flat ground: no wind, worn cement or new asphalt, 80*F, 70% Humidity.
'98 Integra Automatic (modified slightly)
TPS ~15-16 (minimum = 9)
Speed ~ 45 mph
Full TC lockup, 4th gear, ~ 1800 RPM
FE ~ 47-50 mpg (until LOD changes as vehicle accelerates or decels -- not a whole lot of flat land here).
Just as clarification, I meant the highest for flat ground while on the accelerator, not the highest gas mileage using technique.
I'm not driving with an auto trans - but on the flat & holding pedal steady I've seen as high as 73 mpg (at 45mph) and 64 (at 55mph).Too bad that Columbus was correct in assuming the world was not flat...