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Sorry, not seeing how you're coming to the conclusion that a bigger engine should get better mpg than a smaller engine based on the idea that higher air density is beneficial for FE. It's the ratio of air to fuel; the larger engine would presumably consume more fuel along with more air so the ratio would essentially be the same as the smaller engine.
Is it your belief that warmer intake air in a turbodiesel will get you better FE than cooler intake air? If so, do you have some data supporting that? Does that mean turbodiesels should not be seeing a benefit from intercoolers?
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