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Re: Another fuel mileage debate...
Most engines at higher RPMs while cruising produce more power than is being consumed by the vehicle to move it along. A V8 will almost always get better gas mileage the lower you can keep engine speed, however, that is assuming there is enough torque output at that rpm to maintain vehicle speed. I'd try it both ways for a tank or two and see what works. What you wanna do is try to keep it in it's sweet spot of volumetric efficiency/peak torque.
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