loose RPM gain MPG


Asked by Jun 30, 2016 at 05:27 PM about the 1998 Dodge Ram 2500 Laramie SLT 4WD Extended Cab SB

Question type: Car Customization

my 98 ram quadcab  runs 2200 rpm @ 62 mph by increasing tire and rim size i
hope to drop my rpm. what is the biggest road tire (circumference) that can be
possibly install on this truck

3 Answers

Bob Beaman

Put too big of tire and wheel on will actually make the fuel mileage go down. Also when changing tire sizes you have to consider odometer and speedometer error when figuring fuel mileage.


why does a bigger road tire lower my MPG. the 5.9 has enough torque at lower RPM. my thought is that instead of messing with gear ratio i can accomplish the same with larger tire circumference.. the truck has 245/75 r16 mounted now with lots of fender clearance. the speedometer difference can be remedied very easily.

Bob Beaman

Bigger tires have increased rolling resistance, they are less aerodynamic and they weigh considerably more. They will take slightly more power to get rolling and keep rolling.

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