Minnesota drivers would pay an extra four-cents for a gallon of gas under a bill approved by the Senate Taxes committee last night (Mon). Minnesota Public Radio's Martin Kaste reports. The Senate bill would raise the per-gallon price you pay at the pump by two cents this summer, and then another two cents next year. That's in addition to the current 20-cent-per-gallon tax. The money raised by the gas tax is supposed to be spent solely on transportation, and that means most of the money goes to highways and bridges. The highway construction lobby and rural lawmakers have been pushing for the increase, which they say is long overdue. The last increase was in the late 80s, and the bill's author, Willmar Republican Dean Johnson, says it's time to catch up