For everyone out there who has their KJ Frankenlifted and with 245 of 255 tires, what kind of gas mileage are you getting? I'm setting aside money for the lift right now, but I kinda want to make sure I wont be getting 8 mpg on an 18 gallon tank. I realize 20 isn't realist, but I'm getting 16 now and was wondering how much worse it'll get. Thanks.