in NC you can run 1600 gal a year tax free or 5% dino. this is for the homebrewer but the commercial users are about forced to pay a fuel bond to insure taxes are paid. I know this does you no good but a lot of states are passing new legeslation about taxes on alternative fuels that make it easier on us homebrewers. there are also the people that are on the other side of the fence making things more difficult on us. long into short you may want to check withyour state gov..