AMHERST, Mass. - Tired of pulling into the gas station nearly as often as you pull into your own driveway? Six University of Massachusetts mechanical and industrial engineering students have spent the academic year designing and building a car that may deliver as many as 1,000 miles per gallon. Led by professor Ian Grosse, the team will compete in the National Supermileage Design Competition in Marshall, Mich., June 12. It will be the University’s fifth year of participation in this collegiate competition, which draws roughly 30 teams from throughout North America, and is sponsored by the Society of Automotive Engineering.