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The EPA published a report saying that water injection can improve diesel fuel economy by 6%.
I tested a basic water injection rig on my diesel and it improved fuel milage 4%.
Government mandated emissions junk is reducing fuel economy by 5 to 10MPG on diesel pickup trucks. A modern fuel injection system with a response tune will produce hardly any soot and get the fuel economy of a full size car.
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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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