content: If you have a bunch of fuel types it means reduced use for each (raising price) and the store needing a bigger footprint to sell all of it raising their overhead and thus their prices. The Gas/Diesel situation is very similar for the station so minimal footprint add and the addition of diesel brings in commercial so is worth the addition of one type. If we had Ethanol, gas, propane, diesel you would have many places that would opt out of one or two and a nightmare for some to find the right fill station when traveling. I expect propane would continue to be the one to suffer. Ethanol all I really know is from hearing from others, it is used in flex fuels and if they get any water in them they are really not happy about it and run like crap.