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2017 GMC Denali 2500HD, 3.5" Rough Country Lift, 305/55R20 Yokohama Geolandar A/T
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First, you probably don't have the switch installed correctly, which would keep the truck in Tune 1, which is almost always stock settings.

Second, running delete tunes before deleting is asking for expensive problems. Don't do it.

Third, @L.R.S. I would highly recommend you do not tow on #4 if that is your economy setting, especially if you're using the truck for hotshotting. You're going to smoke your transmission. Diesels typically get better mileage when you crank the horsepower. The economy setting on most every boxed tuner (meaning the tune wasn't written specifically for only your truck) is usually a 100 to 150hp gain and meant for unloaded daily driving. Hooking up to a heavy trailer on that setting without a built trans will limp your transmission real quick.

Lasly, deleting or otherwise altering the emissions systems on vehicles in the United States is a federal crime and discussions regarding the tuning or parts removal is against forum rules. I have to close this thread.
 
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