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Well I was able to replace worn out ecopia tires that were aired up to 44 psi with Michelin energy saver tires at 36psi and saw no reduction in range or efficiency and I was watching for it.
Old worn out tires are supposed to be the most efficient they will ever be.
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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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