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Old 11-04-2008
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Originally Posted by richyrich View Post
Holy crap this is news to me!! Forgive me for maybe sounding dumb but I always thought fuel mileage was directly related to the engines RPM's.

Everyday I drive my truck I try to keep my RPM's under 3000 thinking I am saving money but sometimes to do that I am in a higher gear than I know I should be for the speed I am going and yes I am over half throttle to maintain the speed. Due to the fact my gear ratio is not right for my tires.

So you are saying I am better off driving at higher RPM's with the throttle closed more? Will I actually get better MPG this way than the way I have been driving?

Man if this is true I learned something today....
As a general rule, lower RPM's are better, especially under acceleration. But if your engine is bogging you are doing nothing for MPG. If it's auto, it's as simple as just being easy on the pedal, the manufacturer should have set the transmission to give optimal MPG at cruising speeds. If it's Manual, check the owners manual for reccomended shift points.
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Old 11-04-2008
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Originally Posted by Fx4wannabe01 View Post
sticky this people!! That first thread reply....was probably my biggest reply ever!!

*installing 4.88's as i type!!*
as you type? that is ipmressive
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Old 11-04-2008
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^^Yes....i'm THAT skilled yo.

Lower RPM's are not necessarily better. If the truck is bogging/lugging, it's certainly not helping at all in the mpg or driveability department. My truck with the manual + 4.10's + 35's......at speeds of 65mph, she gets decent mileage, BUT once a hill hits or a slight grade increase hits...you better believe it's alot of throttle in 5th to keep the truck moving.....the occasional down shift to 4th is needed sometimes, though seldomly. I've seen 11mpg going up a slight hill at 75. If the engine is working hard, you won't get good mileage period.

I find from my experience.....autos can overcome tire increase sizes better for drivability compared to manuals.....manuals mechanically can hold up better than the autos due to tire increase w/o gear change....but manuals...you can really feel the 35's compared to the auto.

'01 XLT disguised as a '03 Fx4 Level II

Big. Loud. Slow. Bright.
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