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Optimizing the gearing to lowest BSFC "island" is a fine idea for generators, boats, or even airplanes (Junkers Jumo 205) but cars and trucks operate under a fairly wide speed range. Keeping the vehicle on the optimum island is a piupe dream.
Secondly, turbo diesels have flat torque curves (at the low end of the operating range) and their BSFC "islands" at wode toward lower RPMs.
I have a hard time believing a Cummins at 1950 RPM will get better MPG than my International at 1350 RPM.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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