I should know this but back to the question if LNG or CNG is taxed, not sure, but propane is. In 1979 I worked with a guy in Midland who had a propane pickup (dual fuel) and when you bought the propane you paid some sort of tax and they gave you a tax receipt. If you got pulled over and didn't have the receipt, you could be in trouble. I guess they figured you could steal propane from other tanks, or even someones grill if you had the proper hoses.

I always wondered how they measured propane into vehicles. For gas grills they weigh the tank before and after, I know they don't do that on cars.

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MB-less