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Not to many shops if any will delete your truck. It's a federal offense to remove pollution systems on these trucks. A shop could end up in court in front of a federal judge. Even if you don't have smog checks. Not sure how they would find out in a no smog state but Merphys law applies.
Most guys report using about an extra gallon of fuel to complete a regen. I record fuel mileage on a tank by tank basis. If I had two regen events per tank that’s about a 10% hit. There’s more to it than that though, the considerable exhaust restriction of the catalyst and the dpf hurt efficiency over the whole tank, which isn’t as much but it does hurt. I saw my calculated range before delete of 17-18 increase to 19-20+ after on summer fuel. That’s no trailer, just tools in the covered bed, mostly highway.