mjncad
Super Member
I have a 1999 F-250 4x4 extended cab, long bed with a V-10, 5-speed manual, and 4.11 limited slip rear end. I average between 13 - 13.5 MPG with it.
I'm not a fan of cruise control; but I decided to try it for a couple of tanks of gas, and it seemed to actually lower the MPG instead of raising it. My mileage dropped about 0.5 - 1 MPG.
My thought is that cruise control would raise mileage by keeping the speed more constant than I can with the gas pedal. But after my experiment, I'm theorizing that the constant micro adjustments CC makes to the throttle to maintain a set speed actually lowers the MPG.
Any thoughts on the theory? I went back to driving the truck without using CC.
I'm not a fan of cruise control; but I decided to try it for a couple of tanks of gas, and it seemed to actually lower the MPG instead of raising it. My mileage dropped about 0.5 - 1 MPG.
My thought is that cruise control would raise mileage by keeping the speed more constant than I can with the gas pedal. But after my experiment, I'm theorizing that the constant micro adjustments CC makes to the throttle to maintain a set speed actually lowers the MPG.
Any thoughts on the theory? I went back to driving the truck without using CC.