Quote:
Originally Posted by Emher
It's the "all enabling conditions" that kills it methinks. You'd need to have a straight road with no hills that would make the engine switch to V8 mode. And I'm not entirely sure it actually save that much gas. My 4 cylinder gets at most 26 mpg, my dad claims he's gotten it up to 30 mpg. And several drivers of the 4th gen on this board has claimed that they get 30 mpg with ease, so the difference is...? And right me if I'm wrong, but an engine that has more power at low revs, say an LS3, would logically give at least a good a fuel economy as a turbo 4 that has to build up a bit to the power?
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More friction with more cylinders and the individual pistons and all the goodies they attach too are generally heavier and larger, so it takes more energy to move them, but I am not an engine expert. I am sure there is someone on here who can give a better explanation. The AFM is generally only good for a few MPG anyway, which was your original point.