We operate 31 pieces of Caterpillar equipment, 35 front discharge concrete mixers, 26 tri axle dump trucks, and 4 dump trailers, oh, and an 1800 kva MTU genset. Our fuel tanker loads from the same dump, for off road or on road fuel, and the man at the fuel depot adds the dye to the off road fuel. This is in new York state. This indicates to me, that they are the same low sulper fuel, red dye added to the off road so the feds can see if you are using lower tax rated off road fuel in your road vehicle. I am sure someone will want to argue this point, but I have seen it myself. Don't know what the other states do, but this is what is happening in NY.
Have a great day,
jd