tlcruiserman said:.
Another interesting note is the dye that is used can always be detected even after you stop running it, as long as you have the same tank it is very hard to get rid of it.
If that were the case every farmer would be paying up. Most that I have been around don't run ag fuel, Gas or diesel because they do check in rural areas. That said I've seen just about every farmer top off or fill a tank here and there to get to town to fill up. Heck last time I was in Iowa pumped a few gal of the farmers gas. No way I could have made it to town on the fumes since I was driving around on dirt roads all night trying to find his place.