With EVs and other fuel-efficient vehicles saving consumers money at the pump, Oregon will be the first to issue a per-mile road tax to refill its coffers.

Automotive News reports the state will offer two options to its motorists: pay at the pump, or pay a 1.5-cent rate per mile traversed. The latter will be conducted through a device that plugs into a vehicle’s OBD port, then gathers mileage data to determine how much the motorist will pay in tax.

Right now, the program — set to begin July 1 — will be implemented by the Oregon DOT in partnership with Sanef ITS Technologies America and Intelligent Mechatronic Systems, the latter supplying the aforementioned OBD mileage reader.

Up to 5,000 volunteers will participate in the initial program, which will compare the tax paid at the pump to the miles driven. The results will be turned over to ODOT, which will then determine if a motorist is given a refund or an invoice based on said findings.

Oregon won’t be the only one to undergo a road tax program: over 10 other states are either in the process of passing legislation or conducting trials for such programs.