Checks in Indiana
Well, I guess in Indiana we have pushed the point and they are cracking down big time. At the road blocks they set up they stop EVERY diesel, and dip EVERY diesel. If you are pulling a trailer you are weighed, and if you are over weight you are required to obtain DOT numbers, and ticketed. Then if you are dipped and are found to have red fuel your whole truck is given the "once over". They check springs, maintainance records (they are required to be in the truck if you use it for business), Log Book (yes even in a pick-up if you are using it for business), they even check the plumbing of the fuel system to see if you are using the in-bed fuel tank. If you are hauling a load they check tie-downs and ticket if you are not properly "tied-down". I only learned this because a friend who is running a lawn care business got ticketed majorly. He got ticketed with: no DOT #'s, improper tie-downs, off-road fuel, no log book, no CDL. After this 1-1/2 hour long ordeal he was informed that one officer was in the motor carriers division, and the other officer was with the IRS, and his state taxes would be examined.
This has been enough for almost everyone that I know to quit running red fuel. Eventhough, you can save a TON of money running it. I can say that due to my friend driving so many miles, he as saved 10X's what the ticket cost him. But, vowes to run only on-road fuel.