what exactly re-gearing does
#26
11-04-2008
Join Date: May 2008
Location: Tampa Bay Area
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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....
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....
#27
11-04-2008
Join Date: Aug 2006
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#28
11-04-2008
^^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.
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.
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