XRT Tune/Mileage/Tire Size Cal. - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 3 (permalink) Old 07-25-2010, 06:48 PM Thread Starter
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XRT Tune/Mileage/Tire Size Cal.

For XRT users wat turbo tuning do you use and wat tune do you use for best fuel economy? Also anyone wit aftermarket tires did you set your XRT to the specified tire size??? I am trying to figure out this speedo thing cause i believe it is off i have a GPS and if i set my XRT to the correct tire size im off bout 3-4mph from my speedo. Now if i set it below my tire size im right on wit my GPS so wat gives???? Do i trust the GPS always or do i actually go by slower speedo??? I also have saw my best mileage on the "hwy" is the hot damn 175 wit NO TURBO TUNING and i got a best of 22.3 hand calc on 497mi before a pit stop.

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post #2 of 3 (permalink) Old 07-28-2010, 05:47 AM
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I had aggressive turbo tuning downloaded to keep egts down towing my trailer, and running Hot damn 175 empty I got my best mpg. I set my speed by gps, ended up being almost 2 inches less than actual tire size. No biggie though. FWIW, when I got my MiniMaxx I set it to the same small tire size and the speedo was right on!

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post #3 of 3 (permalink) Old 07-28-2010, 06:30 AM Thread Starter
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Sweet i run the non turbo tune hot damn 175 and it is the best so far on mpg only 3psi and roughly 650-700 egts on flat!

2011.5 6.7 HO Crew Cab Laramie Dually 4x4 H&S A-1 H11 Studs GDP Pro Gate AFE drop in Isspro EV2 Boost/EBP RDS 90 Aux Tank/Toolbox Combo Reese 20k 5th wheel

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