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Not sure what to do besides put numerically lower rear gears in it or a transmission with more over drive.
Supercharged gas engines just suck gas.
You may be able to put a clutch on the supercharger like Toyota did with some of the MR2 supercharged engines. Toyota did it to keep miles off the supercharger, so it will last longer and increase 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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