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Down here in the states, propane is currently about 15 cents higher than regular gas. I just filled up my tank at home and it was running about $2.50 a gallon when gas was $2.30. Mileage and performance on propane sucks too, so it is not too cost effective to switch.
A lot of delivery trucks, busses, cabs and police cars are set up to use CNG (compressed natural gas) which burns very clean, performs better, and does not get quite as bad mileage.
A lot of new vehicles that are marked "dual fuel" here are set up to run ethanol / gas blends of up top 15%. If you are lucky enough to be some where that sells it, it is about a third cheaper than straight gas thanks to heavy government subsidies.
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