I have been getting 12-16 mpg with my '25 crew XR on 31" tires. Last ride I checked it was 4 adults (800-900lbs of people/cargo), we drove 163 miles and it took just under 11 gallons to fill back up. (14.5 mpg) A/C was on for at least 40 miles. Hunterworks clutch cover and Dalton primary spring from HW. This did lower the engine RPM to almost exactly what my Polaris General XP4 on 32" tires runs which also gets around 15-16 mpg. Sorry you are seeing such low numbers, I'm pretty happy with what I'm getting.