Quote:
Originally Posted by Cobb
Run Data:
Acceleration Run 1 Run 2 Run 3 Run 4 Avg. MPG Avg. Gallons Used
Slow (~1800rpm) 28.6 27 28.4 26.6 27.65 0.036
Med. (~3300rpm) 24.9 23.2 25.2 24.43 0.041
Fast (5000+ rpm) 19.9 21.3 21.1 20.77 0.048
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I would argue that 1800rpm isn't 'slow' acceleration, that's actually probably around BSFC. The argument for accelerating 'fast' isn't to rev to 5000+ RPM, its' actually to use high loads to accelerate.
We know more RPM will use more fuel.
The real issue is shifting at the same RPM but varying the throttle opening. I've always found heavy foot low rpm (~2000) to work the best (carb, EFI, petrol, diesel, NA, or turbo it's always worked). Most people trying to save fuel are afraid of using the accelerator when they shouldn't. Although light throttle doesn't 'waste' fuel, if you can move faster for no economy penalty you might as well. I think this point would bring hypermilling to the interest of a lot more people too.