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Wildcard85, Try to check your speedometer and odometer with a gps or mile marker signs on the highway. Figure out if they are even close to accurate and then figure out which way they are off. You have to do that before you can figure accurate mileage. Then I would suggest you change your...

My M1009 consistently got 19-22 mpg all stock. I put 33x12.50 tires on and running the same gps road speed still got 19-22 mpg in all kinds of driving. It couldn't pull hills above 52 mph either. I put in a new pump and haven't gotten better than 17 in the last 4 months running the same basic...