FUEL ECONOMY: Wayne Gerdes hypermiles 2011 Kia Optima Hybrid to Guinness record with 64.55 mpg. “Kia’s 48-state challenge was completed in 14 days, with the Optima Hybrid averaging 564 miles a day and consuming just over 5.5 tanks of gasoline. Crunch those numbers and you’ll discover the Optima Hybrid averaged 1,418 miles between fill-ups. That, right there, is what hypermiling is all about.”