Forum Discussion
tatest
Jun 25, 2014Explorer II
Don't even think of it as difference in MPG, rather as 0.5 GPH (A/C is roughly 1/2 load)  or about $2 per hour to have the house cool. 
Impact on MPG depends too much on all the other things that impact MPG, e.g. wind drag and travel speed. Running A/C drops MPG a lot more at 30 mph than it does at 70 mph, and sitting in a parking lot you are getting 0 miles per gallon while still burning 1/2 gallon per hour.
Impact on MPG depends too much on all the other things that impact MPG, e.g. wind drag and travel speed. Running A/C drops MPG a lot more at 30 mph than it does at 70 mph, and sitting in a parking lot you are getting 0 miles per gallon while still burning 1/2 gallon per hour.
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