[derekgas]

Fuel is bought in grades, the cheaper the fuel, the lower the grade, some really cheap stuff will have contaminents like water in it, as for prices, this is the way they operate, government, gas/electricity suppliers, supermarkets, etc, poll tax was a prime example, it was ten times the amount paid in rates, after the furor, the council tax was brought in somewhere around half the price, people accepted it without question, even though it was still much much more than the original rates system, the gas went up 100 percent, came down about 10%, and will creep back up again, just like the petrol did.