Yes, vehicles have become more fuel efficient, but a just-released report by the Institute on Taxation and Economic Policy shows that inflation is 3.5 times more responsible for the decline in the purchasing power of the gas tax.
House Ways and Means Chair Paul Ryan said it best in his opening statement on June 17 in the first Congressional hearing on transportation funding in three years [posted here]:
People have been using less gas. They’re driving more fuel-efficient cars. You get a lot more miles to the gallon than you used to. And so gas just doesn’t track use as well as it used to. And we can’t just chase fuel efficiency with higher taxes. [Italics added].
Two days later, Vermont Transportation Secretary Sue Minter agreed, and pointed to Oregon's new pricing program, OReGO that begins July 1, based on mileage driven, not fuel consumed, as holding much promise.
However, the Institute on Taxation and Economic Policy (ITEP) concludes that the vehicle miles traveled fee (VMT fee), called a road usage charge by the Oregon Department of Transportation (ODOT), is a "half-baked solution."
To understand why, one must recognize that the primary reason the current gas tax is losing its effectiveness is not vehicle fuel efficiency but inflation, specifically construction cost inflation.
Over the same twenty-year period that national, on-road fuel-efficiency improved by 12 percent, transportation construction costs grew by 60 percent. The result is that for every $1 that fuel-efficiency gains drained from the purchasing power of the nation’s transportation funds, inflation has taken a much larger $3.50.
Simply put, OReGO's flat VMT fee of 1.5 cents per mile driven is no better than the state's flat gasoline excise tax of 30 cents per gallon, though a deal is in the works to hike it by four cents over two years by sacrificing the state's three-month-old clean fuels program.
The June report actually praises the VMT fee (though they refer to it as a tax) when it comes to dealing with fuel efficiency and alternative fuels reducing gas tax receipts:
Indeed, as cars gradually transition away from gasoline as their primary means of propulsion, something akin to the VMT tax will eventually have to be implemented if drivers are going to continue to pay for their use of the roads. There is no doubt that Oregon’s new law, if successfully implemented on a comprehensive and mandatory basis, would be immune from tax base erosion occurring because of rising fuel-efficiency.
Much has been made of the significance that Oregon was the first state to pass a gas tax in 1919, and now is the first to transition, if only partially, to a VMT fee. Yet ITEP sees irony there:
The federal government and 31 states, including Oregon, levy fixed-rate gas taxes that are vulnerable to the impact of inflation. Oddly enough, this design flaw can actually be traced back to Oregon, which implemented the nation’s first gasoline tax in 1919 at a fixed-rate of 1 cent per gallon. Within 10 years, every state followed suit with their own fixed-rate gas taxes patterned after Oregon’s law.
The reason why the road usage charge is flat and not indexed for inflation is because that's what the authorizing legislation, SB 810 indicated. In fact, Planetizen describes the bill as Plan B in its first post on the program after a stronger bill failed to pass.
ITEP's 2011 report addressed the fundamental problem of flat gas taxes and how to correct them, posted here.
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