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I have seen the oem's claim that alternator cut out increases fuel economy by up to 5%.
When someone just cuts power to the alternator and charges with external power the improvement is more like 3% if you are lucky but usually it's not even noticeable. Because the alternator is still using engine power to spin.
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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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