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In terms of fuel economy, don't worry about it, if you intend to use it on a gasoline engine.
Now if you were going to swap a smaller engine into your existing vehicle then you might want to think about using P&P for maximizing power.
Driving around using as little throttle as possible, porting and polishing is not going to have much effect on fuel economy.
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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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