I have a 08 GMC Serria four door crew cab Z-71 4X4 with the 5.3 V-8 and 3.73 gears. My 99 Z-71 had the same engine and gear ratio and it did very good also. Driveing style does have a lot to do with it. I got better mileage pulling my old G-3 boat than I do pulling the Sea Ark....but the Sea Ark is wider and taller and catches a lot more air and its a little heavier also.


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