Weird, ain't it? In some cases, AC in fuel vehicles can HELP mileage due to streamlining and drag reduction. But even if it doesn't, you just spend a few minutes refueling the liquid battery!!
At least the a-bodies have the crotch boxes (fresh air ducts under the dash). You can just open the vent boxes, wear a loose pair of shorts, and let the fresh air go up one leg and down the other to keep your crotch cool... :)