We run the green stuff in our trucks. But prices being what they are the extra savings adds up when you are doing hay etc. So our green Truck spends a fair amount of time being a mobile fuel dispenser in the field .It would be an incredible long shot, but don't get caught running the tax exempt stuff in a non-commercial vehicle on the road.
They get pretty pissed about it.
The "red" is a dye that will dye the insides of your carburetor/ fuel injectors.