Ok I know this has been talked about before but I cannot find it anywhere. Is it just my imagination or has my gas mileage gotten that bad. I went from stock Wrangler 255/65/18 to BFG 275/70/18. I was getting between 20-22 on the road and about 17-18 in the city. Now I seem to be getting 18 on the road and 16 in the city. Are these real numbers or is it the large tires causing problems with the MPG calculations?