Car alts aren't very efficient.
They have to spin so fast all the air drag kills efficiency.
At lower speeds running near full load for that speed they are most efficient.
H2 is a fuel just like propane or natural gas. But unlike propane, gasoline, diesel, alcohol or natural gas, hydrogen isn't a very good motor fuel.
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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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