New Hampshire’s tax on gasoline and diesel would rise for the first time since 1991 under a bill being voted on by the House next week. Supporters say the proposed 4-cent increase would provide much-needed money to fix deteriorating roads and help finish the expansion of Interstate 93. Opponents say the hike would cost consumers and truckers at the pump and lead to higher prices on goods and services. The bill would increase funding for highway improvements for two years, then earmark about half the proceeds to pay off $200 million in borrowing to finish the Interstate 93 expansion. A joint House committee is recommending passing the Senate bill directly to Governor Maggie Hassan, who has said if a consensus is reached on a tax increase, she will sign the legislation. New Hampshire’s 18-cent tax is the lowest in New England and would remain the lowest if it is increased 4 cents.