Stupid is as stupid does. Possible gas tax increases WHEC-TV updated 1 minute ago Just when gas prices have come down, there could be more taxes on gasoline. A federal commission created by Congress to find ways to help build and repair highways is recommending a 50 percent increase in gas and diesel fuel taxes. In a report expected later this month, members of the commission say they will urge Congress to raise the gas tax, now 18.4 cents a gallon, by 10 cents, and the diesel fuel tax, now 24.4 cents a gallon, by 12 to 15 cents. At the same time, the commission will recommend tying the fuel tax rates to inflation.