Today, reader Morris directed my attention to a proposal by the Truckload Carriers Association for a "Gallons-Based User Fee” or GBUF. Though described as a “simple, common-sense update to the current fuel tax,” it is nothing more than an increase in the existing federal fuel tax along with an “annual registration fee for electric vehicles.” That fee would be $250 annually for electric vehicles and $100 annually for hybrid vehicles. The proposal also includes repeal of the federal 12 percent excise tax on new trucks and trailers. The proponents of GBUF make two arguments. First, they argue that the “federal fuel tax is the most efficient and cost-effective way to fund highway improvements.” Second, they argue that the GBUF “does not require a new collection system or a costly bureaucracy.” They don’t mention that they are not so subtly changing the designation of the revenue from a tax to a user fee, perhaps to make it appear new or perhaps, and more likely, to avoid accusations of supporting a tax increase, something that finds little favor these days.
The proponents make no mention of the fact that some states have already implemented the mileage-based road fee in some form, whether as a pilot program, a voluntary opt-in arrangement, or some similar plan. Though the mileage-based road fee does not require a costly bureaucracy because it would rely on existing vehicle and internet technology to calculate and impose the fee, it easily could be adapted so that states use their fee collection system to collect revenue on behalf of the federal government and remit those collections to the Treasury.
I wonder if one of the reasons the Truckload Carriers Association prefers raising the fuel tax instead of opting for a more accurate mileage-based road fee is that the road fee takes into account the weight of the vehicle, because the heavier the vehicle the more damage to the roads, bridges, and tunnels. For example, compare a 10,000 pound diesel powered box truck with an 80,000 pound diesel powered tractor trailer. The former gets between 13 to 20 miles per gallon whereas the latter gets between 6 to 8 miles per gallon. So to go the same distance of 1000 miles, the tractor-trailer would use between 125 to 167 gallons whereas the box truck would use between 50 and 77 gallons. The tractor trailer would use between 1.6 to 3.3 times as much fuel to cover that distance, and would pay between 1.6 to 3.3 times as much fuel tax. Yet the tractor trailer does far more than 1.6 to 3.3 times as much damage to the roads, bridges, and tunnels. According to the GAO’s Truck Weight and Its Effect on Highways, an 80,000 pound tractor trailer “has the same impact on an interstate highway as 9,600 automobiles,” and “a truck axle carrying 18,000 pounds is only 9 times heavier than a 2,000-pound automobile axle, it does 5,000 times more damage.” In effect, the current fuel tax system, no matter the amount of the per-gallon tax, causes lighter weight vehicles to subsidize a significant portion of the damage done by heavier weight vehicles. The mileage-based road fee, with rates set to match vehicle weights, ameliorates this funding imbalance.
Just as bad, a flat fee for electric and hybrid vehicles presupposes that those vehicles do the same damage to highway infrastructure when, in fact, the miles that each of those vehicles are driven can vary from as little as 2,000 annually to as much as 30,000 or more annually. The mileage-based road fee takes those differences into account. The flat fee does not. On top of this flaw, though the GBUF proponents claim that their proposal “does not require a new collection system or a costly bureaucracy,” it indeed would require a new federal mechanism to impose those flat fees.
In conclusion, though raising the federal fuel tax is better for preservation of federally supported highway infrastructure than doing nothing, it pales in comparison to implementing a mileage-based road fee. Fairness and efficiency weigh in favor of a permanent remediation rather than the seemingly easier but eventually ineffective band-aid of raising a 20th century tax mechanism that doesn’t function well in a 21st century world.