You pay the highway tax on gasoline but not on diesel when you purchase it
at the marina..

The (off road) diesel is available to the marina from the distributor
because the refineries provide it with a purple die color so the highway
inspectors can tell if your using it on the road..

Also the purple diesel is high sulfer while that sold for use on the highway
is low sulfer. (so I'm told).

No such thing for gasoline.

I have heard that you can apply for a refund of the highway tax but have
never had that opportunity because my boats have always been diesel.

The marinas jack the price up for gasoline because of their low volume.


--
My opinion and experience. FWIW

Steve
s/v Good Intentions