As I understand it, it's legal to use it in other vehicles but only if those vehicles are used off of the public roadways. For example, if you have a large site

As I understand it, it's legal to use it in other vehicles but only if those vehicles are used off of the public roadways. For example, if you have a large site and must move material internally to that site, you can use untaxed diesel while the vehicles are moving material on site.