Quote:
Originally Posted by oil pan 4
Most things that give a gas engine more power typically lowers fuel economy. . . .
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Unless it's strictly efficiency things that have more power and fuel economy as side effects of lower losses, right? Things like lighter/slicker oil(s), better combustion efficiency (higher compression with effective knock sensors/suppression), super-precise fuel injection, variable timing, etc....
Then I'd expect to see *slight* increases in power at the dyno, and also *slight* increases in fuel economy. But I think basically, if the engine's halfway efficient already (which also means running well and properly tuned), engine improvements are probably not where to find much in the way of increased MPG (short of completely changing the engine). Rather, aero for highway speeds, weight for stop & go, and driving technique ("hypermiling") for both.
Do I have it right?
