Here in New York the price quoted by car rental companies for prepaid gas does NOT include the up to 26% taxes and fees imposed by the various governments. The car rental companies are required to add the 26% to all items on the bill. This includes prepaid gas. Thus$2.50 a gallon gas is really $3.00 to you. While your at it be aware the insurance fees get this tax too.

Bet most states are like that because it is an easy way to raise revenue without the locals complaining.