This is a bit dated but shows that 41% of road upkeep on average is paid for by gas taxes (and other fees). So yes while they may have some tax paid on fuel (that they have likely negotiated down via bulk purchase), they’re not even paying for half on average.
Edit - just to include given we’ve seen landmark inflation over the last few years it’s likely the share of taxes on upkeep has gone down.
12 yr club here 👍