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I know of owner operator truck drivers swear by diesel kleen power service in the grey jug. They claim it makes a difference of hundreds of dollars in fuel consumption over a cross country round trip.
But they are only claiming a 2% to 4% FE improvement on 6 to 8 mpg machines over thousands of miles.
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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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