RPM in relation to speed

[exbass94]

Originally Posted by Jraymer360

What i don't understand is how load decreases gas mileage.

is it because it takes more rpms to get to the same speed at the same amount of time vs. empty?

or because of longer acceleration ..or what.

i don't see how a 10k pound vs a 2k pound car with the same drivetrain ( completely same drivetrain) would get different gas mileage at the same rpm.

well i understand that a heavy car would get worse gas mileage but i don't understand why. its not like a 10,000 pound car is dumping in more fuel than a 2,000 pound car at the same rpm?

Actually, yes the heavier car IS dumping in more fuel at the same rpm. It has to work harder and use more fuel to maintain that rpm than the lighter car.

[doorgunner]

what happened was.....your brothers truck tires squatted down 1&1/2 inches with a load......making them shorter....causing an increase in rpmmmmmms

[85_Ranger4x4]

Originally Posted by doorgunner

what happened was.....your brothers truck tires squatted down 1&1/2 inches with a load......making them shorter....causing an increase in rpmmmmmms

If it isn't the tranny and it isn't spinning tires that is about all you are down to.

If he is pulling enough to unlock the tq regularly he needs to kick it out of od or he will burn it up when it starts hunting through the gears. It is completly normal for a load to make it unlock the tq, and even per the manual it will specifically say to put it in drive when towing a substantial load.

I run all over with my '150 and tractor in tow in direct, it pulls it pretty nice. It would hunt like Elmer Fudd if it was in OD.