So because it's "more expensive in pretty much every other country." One should follow that example to screw "everyone else over." As a point it's $1.42/L($5.32/Gal) Canadian where I am right now, and businesses are already jacking up the prices on everything else.
Where I'm at, it's about US$3.50/Gallon. About $0.50 of that is tax. Also, in my area, that tax (and other taxes and user fees specific to automobile drivers) pay for about a quarter of the cost of roads. The rest is subsidized from non-transportation taxes & fees.
As you can see, if the gasoline tax was increased to cover the full share of the cost of roads, it would make the final cost of gas about $5.00/gallon. That is without figuring out any externalities - such as the 34,000 deaths directly caused each year by automobiles in my country. Or the additional estimated 53,000 early deaths caused by transportation pollution. And that pesky cost of military involvement to reduce oil supply disruptions - while most of our oil comes from Canada, oil is a fungible good, which means any major disruption worldwide will cause gas price shocks.
So while you may think $5.32/gallon is screwing automobile drivers over, I suspect it's too cheap to cover even most of the cost of oil.