Would this possibly only be true under full-throttle? I have damned near a stock 454 and i get peak mileage going 55mph at 2150rpm. -- Andy Quaas Clare Snyder wrote: > Maximum fuel mileage on a stock 454 will be acheived at 2800RPM - which > is the max torque RPM for the engine. on the 350 diesel, it would be > 1600rpm