HYPER-MILING A HYUNDAI SONATA: 1,065 miles on 16.07 gallons = 66.285 mpg! “Gerdes and a traveling companion set out from Milwaukee, WI and made it to Riverhead, NY on Long Island on 16.07 gallons of regular unleaded. . . . The level of concentration required to consistently achieve these elevated numbers would be impossible for most drivers most of the time.”