The federal diesel motor fuels tax is 28¢ per gallon. The states will have their own tax as well. Texas imposes a 20¢ per gallon tax. Connecticut's is 54.9¢.

The federal diesel motor fuels tax is 28¢ per gallon. The states will have their own tax as well. Texas imposes a 20¢ per gallon tax. Connecticut's is 54.9¢. There's also a tax on the vehicle itself. I want to say that it's in the $500 per year range, depending on it's GVWR and the state.