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Just wanted to add one more bit I didn't notice mentioned previously.
Sense Leaner Air to Fuel Ratios burn slower ... some engines that make use of significant Lean Burn modes ( like the Gen-1 Insight ) ... also tend to lower the ICEs operating RPMs during high Lean Burn operations ... lower RPMs = less friction.
Attached is part of one EPA test describing both the BSFC already discussed and the friction benefits as well.
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