But what's the BSFC for an engine at part throttle? I still haven't seen a good explanation of this aspect of engine/drivetrain design. My gut tells me it's not reasonable to say that because my 340 has it's peak torque at 4000, I should set my highway cruise at 4000rpm for best mileage. Somehow a 400hp Corvette can pull mid-high 20's on the highway while turning maybe 1500rpm. Torque peak on a Z06 sure isn't below 2Krpm. Until I can sort out how VE relates to a throttled situation, I'll stick to thinking that best economy is going to come at the lowest possible engine speed that you have good fuel control.
