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How many MPGs do you loose when running AC?

I have an OHC doing 70 (about 2k rpm) on the highway it shows roughly 17-18 with ac on and then 19-21 ac off, windows up or down have ZERO change.

oh also I have a 4.0L 3.07 gearing 1999 np231 ax15 with 235/75/15 tires with the proper speedo gear.
 
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