By Eileen Houlihan, Senior Writer/Editor, ARTBA

Six states raised their gas taxes on July 1 to help pay for critical transportation infrastructure repairs and expansion, but retail pump prices mostly fell the next day, according to a national report.

Idaho, Georgia, Maryland, Rhode Island, Nebraska and Vermont increased their gas taxes to begin the new fiscal year. The largest increase, 7 cents-per-gallon, came in Idaho. Georgia’s gas tax increased 6.7 cents-per-gallon. Other increases ranged from 0.35 cent-per-gallon in Vermont to 1.8 cents-per-gallon in Maryland.

The tax increases, however, did not translate to a next day penny-for-penny increase in the retail price paid at the pump, keeping in line with a recent ARTBA analysis showing only a percentage of the levy is passed on to motorists. Daily data from AAA show the national average retail price of gasoline slid 0.5 cent from June 30 to July 1, while the largest of only two gains in state retail prices took place in Nebraska, where prices rose 0.3 cent. In Idaho, where the largest gas tax increase of 7 cents went into effect, prices rose just 0.2 cent. July 1 prices decreased in the other four states.

On July 2, the national average retail price rose 0.4 cent, while the largest state gain in prices was 3.1 cents in Idaho, followed by 0.7 cent in Georgia. State prices in Maryland, Rhode Island, Nebraska and Vermont, however, fell from July 1 to July 2. And prices in all four states remained below those on June 30, prior to the gas tax increases taking effect.

ARTBA’s recent “Pump Shock” study tracked the market impact of five state gas tax increases enacted in 2013, noting the retail price for a gallon of regular gasoline the day after, one month after and one year after a state gas tax increase went into effect. The research found that, on average, the price for a gallon of regular gasoline the day after a state gas tax increase goes into effect only reflects about 22 percent of the new levy.  A month after enactment, only about a third of the levy shows up in the pump price. And, one year after enactment of a state gas tax increase, the average price for a gallon of regular had dropped, on average, 3.7 percent below the market price the day before the tax increase went into effect, larger than the drop in the average national retail price for the same time period.

According to the U.S. government’s statistical energy arm, the Energy Information Administration (EIA), the four factors that drive the retail pricing of gasoline are the price of crude oil, refining costs and profit margins, retail and distribution costs and profit margins, and taxes. The agency said the price of crude oil and refining costs and profit margins drive most of the variability in pump prices.

The July 1 gas tax increases are the latest in recent moves by states as they deal with uncertainty surrounding federal transportation funding, which faces a July 31 reauthorization deadline. This week Washington state approved over $1 billion annually in new revenue for the state’s transportation infrastructure, funded in part by an incremental 11.9 cents-per-gallon state gas tax increase. Washington became the seventh state in 2015 to increase their state gas tax.

While nearly 40 states have introduced measures relating to transportation funding so far this year, the federal Highway Trust Fund (HTF) remains the source, on average, of nearly 52 percent of annual highway and bridge capital investments made by state governments. ARTBA continues to push Congress ahead of the July 31 deadline. The association’s  “Getting Beyond Gridlock” (GBG) proposal would put the HTF back on sound financial footing with a 15 cents-per-gallon increase in the federal motor fuels tax. It would fund a six-year, $401 billion highway and public transit investment authorization and permanently eliminate the program’s $16 billion per year “funding gap” while allowing for new investments in the National Freight Network aimed at improving the movement of goods.