Yes.
If so that is deliberately deceptive.
Why? It is part of the price at the pump that everyone compares and talks about.
They collect it up-front and have to pay it ‘back’ to the gov’t.
So, Exxon and every other business owner is a tax collector for the gov’t.
Failing to pay these sales taxes get many companies in trouble, either through honest mistake or dishonesty.
Difficult to say if there is a better method to send the sales tax directly to the gov’t. It would get rid of just one more burden on business.