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If you slow the engine down too much you fall out of its efficiency range. Even worse yet, combustion and crank shafts harmonics tear up the rod bearings.
Figure out the lowest recommend cruise rpm and gear for that.
Pushing the operating range down to say 1,000 rpm is just going to ruin the engine.
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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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