I always used to find with my old LPG V70 that it would be better on Shell.
I also came to believe that the LPG sold by Morrisons supermarkets would give worse economy than gas from the likes of Shell and Calor.
I was once told that it was possible to work out where a driver regularly bought his LPG from, based on the state of the LPG filter at service time. The dirtier the filter the more likely it was that the car was most frequently filled with supermarket gas!
Jack
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