Hey Biz Doc..
You asked the difference between on road and off road fuel. It is in the parts per million in sulfur. Here in the states they instituted a "clean fuels" program for diesel in mid 2006. (Ultra low sulfur) I believe that on road diesel now contains 15 ppm and off road is much higher. That is why they dye the off road so that if they check fuel tanks they can spot truckers or whomever cheating.
Expensive refinery upgrades but they have paid for it ten times over.
You asked the difference between on road and off road fuel. It is in the parts per million in sulfur. Here in the states they instituted a "clean fuels" program for diesel in mid 2006. (Ultra low sulfur) I believe that on road diesel now contains 15 ppm and off road is much higher. That is why they dye the off road so that if they check fuel tanks they can spot truckers or whomever cheating.
Expensive refinery upgrades but they have paid for it ten times over.