Looking to buy my wife a Fox mustang to get out from payments but gas mileage is a concern since she drives 40 miles a day. I was thinking a 2.3 would do her nicely, but the gas mileage isn't really that great with them. I bet I could get just about as good gas mileage with a 5.0. The car must be an auto, and she does sit in stop/go traffic alot. Any idea what kind of mileage we can expect?