How much gas does my 2008 Toyota Sienna use with the air conditioner on?

Question

My mother and I are debating over gas mileage. Whenever she rides in my van she wants me to turn the air conditioner on. I swear the woman probably uses her air conditioner in the winter! I told her that it will ruin my gas mileage. She says it only brings the gas mileage down by a mile a gallon? I know better than to roll down the windows, but with the price of gas lately, I am willing to sweat and suffer with the windows up and the fan on?

What are your thoughts?

Answer 1

its your car/drive it and find out.

Answer 2

Keep gas in it & drive! Its yours, so why not!