I mainly use LPG and have found that united and mobil are by far the best, I do tend to get some massive variations from 1 supplier to the next ranging from 20l /100 all the way to 28/100 for the same sort of driving, caltex LPG is the worst.
As far as diesel all I know is the Telstra work van only has a caltex card in it so it only ever gets caltex fuel and it costs the same $$ / 100 km as my tweaked V8 near 20 year old 4wd when I'm running LPG, diesel by far the most expensive motoring when you consider the extra purchase price and the doubling of maintenance cost over the long run.
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