[steveegg]

Don't know of any state that has other than a fixed gas tax. Higher prices mean somewhat fewer gallons sold and less gas tax.

Check this chart. Kentucky uses a percentage as its tax; California, Georgia, Hawaii, Illinois, Indiana, and Michigan all charge sales taxes; Connecticut has a gross receipts earnings tax based on a percentage; New York has a complicated formula that includes a few percentages, and Virginia adds a percentage-based wholesale tax.

[John Jamieson]

LA is fixed at 20% per your chart. QED