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Try this mod with the belt off the alternator.
With my suburban 100w should only make a difference of about 0.1mpg, which is impossible to track. I am going to guess a car that gets twice the fuel milage of my truck would see about twice that milage increase.
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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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