How many horsepower does an alternator consume at high rpm during a quarter-mile run?

Guess maybe max of
90 amps x 14 volts divided by .85 efficiency = 1482 watts

1492 divided by 745 watts per horsepower
= 2

but could a gain of two win by a distance of a inch to a foot at the finish line.....

at real high rpm the belt/pulley efficiency might be way less than 85%