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I just bought a new 2018 bighorn and tuned it right away. Im happy with the performance of the tune, and zero issues with the install and truck after the tune.

I hand calculated 22mpg (US gallon) through one tank, 3/4 city driving and 1/4 highway (21 mph average). Not too bad for a brand new engine! It could possibly get a bit better as the engine breaks in.

note: 2" level and larger diameter tires were installed as well before the calculation.
 

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I just bought a new 2018 bighorn and tuned it right away. Im happy with the performance of the tune, and zero issues with the install and truck after the tune.

I hand calculated 22mpg (US gallon) through one tank, 3/4 city driving and 1/4 highway (21 mph average). Not too bad for a brand new engine! It could possibly get a bit better as the engine breaks in.

note: 2" level and larger diameter tires were installed as well before the calculation.
Sounds good. You will need to re-calibrate the speedo for the new tire size in order to get an accurate hand-calc. for MPG.
 

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Happy you are happy. GDE is so good to have and deal with. Heck they cooperated with me perfectly sending the new tune quickly in preparation for my AEM tune. Then I swapped out and near immediately credited my account for the return exchange.

Never a hassle with GDE. Their track record is long and unbroken. Enjoy the new ride.
 
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