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it depends on what the belt is driving. If the belt is just attached to (let's say) alternator, but there is NO load, then the amount of power it's taking is very small
Alternator, with all accessories ON is probably robbing about 2 hp on an average car
A/C, when ON, probably 10 hp on most cars. I know on my little civic the A/C drops my MPG by about 12% at 60 mph steady speed. On a Lincoln MKX I drove, the A/C dropped the MPG by about 9% on 60mph
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