I have a 330 +10 set up with dual shorty exhaust and power commander. Going with fat tire setup, I knew I was going to take a hit in the fuel department. However this seems a lil extreme to me. I get close to 150 miles per tank. Is this the norm or is there anything I can do to improve gas mileage? I was thinking about getting a 4 Into 1 Brocks shorty exhaust setup. Any suggestions?