one thing . are you figuring your mileage based on the truck having stock tires? did you ever change your speedo gearing with a tuner or anything bc that will fluctuate your mileage truck thinks it's went x miles but it's actually went many more bc the taller rollout on the bigger tires per revolution ... i get around 11 hand calculated on my black truck and 93 lb 37s and with the more powerful engine and better fuel economy on the new trucks you should easily be higher than that i would think ...
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