Normally you don't have to worry about getting dipped by DOT. But if you did, and have dyed Off Road fuel, you are subject to $1000/Gallon + Fed. tax + Fine up to a total of $10,000. I've been at some cattle auctions where the Fed's came in and dipped the farmers tank's, all Hell broke loose then. Friend from Oregon in the trucking business hauling log's said they use to use off road a lot til they started to dip them, then they just kept track of the Off Road milage and used that as a fuel tax deduction. Can't remember what state, but I use to fuel up at truck stops with my 35 ft GM Bus, I seen on the invoice "No Red Dye Visible" . They will also target large contractor's diesel pickup's. I've also seen them at rest area's dipping the diesel motor homes.