I saw somewhere else on the forum a discussion of specific fuel consumption and an "island of efficiency" related to torque loading of the engine - the load and speed where it is making the best power for the fuel it burns. Find a BSFC map for your engine (good luck - I can't find anything like that for mine), then do the math for your drivetrain to determine what that equates to for your gears. I'm thinking that if you do all your accelerating in that sweet spot, you'll be hitting the best possible load/fuel burn.
Just guessing.
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