Just costs about $.20 less per gallon because it does not include state and federal road tax.
Used to be, off road had higher sulfur, which was better for lubricating injector pumps.
Your Dodge and mowers will run great on either.
There are usually high fines for using untaxed fuel in your truck, and it is easy to spot because it is dyed red like transmission fluid.
But, if nobody is checking....
You didn't hear that from me