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01 yukon stock wheels and tires....I'm getting around 20 on the highway at about 60-65mph...city mpg is uncertain as I don't pay enough attention to it. but I would say in the 14-15 range.
Honestly I have no clue and I thought it would bring some attention since everyone was getting around the 16-18 range.... I was getting around 17-18 when i bought the thing and replaced my spark plugs and coil pack wires with iridium plugs and just regular wires from advanced auto parts and I think it gave that little bit of extra bump to get my mpg up.....but since we are on the subject if someone would let me know what size gas tank i have I could recalculate my mileage and make sure its accurate...I've been calculating mine with a 23 gallon tank so if its too much larger than that then my numbers are off.
Oh and I drive like a granny when accelerating to the speed limit.