In Canada if you get pulled over and tested, all you have to say is I was down a mountain road and ran out of gas and was stranded so put a few jerry cans of red gas in to get me back out and home. Perfectly legal now!The problem with red diesel and using it in a car on the road is that regardless of colour it has some sort of "trace" in it that tests positive . . . years ago when I had a diesel LandRover I was stopped a couple of times and had the tank dipped by the Customs & Excise people (innocent!) - they also said that the trace can be identified even if red had only been used once followed by legal stuff ... something about the pump or injectors?