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A typical 4 cylinder engine can waste up to 2hp just on throttling losses.
2hp doesn't sound like much, until you realize you need less than 10 to 12 horses to maintain highway speed.
Go for less pumping losses. Get a diesel. No throttle therefor no throttling losses.
Or swap in a lawn mower engine that runs WOT to maintain speed, no throttling losses.
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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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