I don't quite understand their logic. By paying the fuel taxes at the pump, we are pre-paying the tax prior to usage, as opposed to pay as you go via GPS. You'd think that would hamstring their cash flow. Then there's Canada & Mexico base plated vehicle traffic. Sounds like yet another stroke of brilliance from the same folks who thought that everyone should own a house they can't afford, and so sent the world economy on a bowl circling spiral.
It sounds to me like yet another pork project that would cost billions to create, billions to maintain, then let's not forget the trillions in retirement and health insurance for life for the GPS tax department folks. As we know, the more it costs, the higher the skim & palm grease yield.
For what it's worth, I don't see the GPS fuel tax issue ever working out. Every state would need to get on board with a compatible data system. An example of why that may not fly -- In the late 80s, the feds decided to take a crack at maintaining one driver's license for every truck driver, known as the CDL. A nationwide data exchange system would prohibit drivers from shopping for licenses in other state, a move that often wiped away old moving violations in the process. Over 20 years later, all the 50 states & AAMVA have still not come to an agreement on one compatible data system. On the other hand, just because a program is destined for non-functionality from day one doesn't mean 'they' won't do it anyway...
For the past few years there has been a lot of press regarding more fuel taxes are going to be required soon to shore up the crumbling transportation & highway infrastructure. Unfortunately, the trillions in fuel taxes we already paid over the years has been looted by the feds & state "general funds" and so now there's nothing left. Same as it ever was...