I was just in PA for a bike race and gas was 30 cents more than VA.
That has been true for a long time. Same sort of thing between VA and MD. One needs to look at how the money is spent, supposively on highways. But I think a lot of it is treated as general revenue by the states. Folks in TN near the GA border would buy in GA. The difference was enough to justify the drive and do other shopping in GA versus TN. That has changed as GA raised their state gas tax a couple years ago. TN raised their's this year incrementally, I believe in two chunks.