With a gas engine you are always fighting the isobaric expansion (throttling losses) that starts off the otto cycle.
The only way I know to beat isobaric losses on a gas engine is to put a tiny effieient little engine in a car, like a twin cylinder 15hp briggs and straton and run it wide open on the highway your top speed will be about 60mph until you encounter a hill.
There is no way around it. If you get more air through the gasoline engine no matter if you use a free flowing exhaust or intake, you have to add more fuel to burn it properly.
See:
Cold Air and Ram Air - EcoModder
Increased compression ratio - EcoModder (click the popular hot rodding link at the end of the page)
Turbo charging - EcoModder
Water injection - EcoModder
Most things that give a gas engine more power typically lowers fuel economy, but on a diesel engine you get more power and more fuel economy most of the time.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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