Highly doubtful. I'm sure the 8 speed trans helps, but if its a V6, I doubt it does. V6's on full size trucks get terrible gas mileage because it takes you giving it more has to get it moving. I had a V6 Silverado a couple of years ago and it got worse gas mileage than my 5.3. Of course, a lot is taken into consideration...such as, tire and wheel size, gear ratio, transmission, suspension and don't forget the driver! Lol. I call bs too!
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