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if the efficiency rate is 60 % that would make maximum draw on a 55 amp alt 1.53 hp. now of course you would only be using that much if you were placing a heavy drain on you battery. under normal driving, the alternator would not be using much hp. but these numbers help us to see why 10% better mpg is possible with an alternator delete. when you figure an engine doesn't produce much hp under 2,000 rpm, lets say 15 hp in my 1300 cc crx, 1.5 hp would make that 10% very plausible.
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