Seoul, South Korea – A Kia Optima Hybrid has set a new Guinness World Record for fuel economy.

The drivers achieved an average of 64.55 mpg (3.6 L/100 km) during a drive through the 48 contiguous U.S. states, using just over 5.5 tanks of gasoline to complete the 14-day, 12,712-km trip. The record was verified by a Guinness adjudicator in a ceremony at Kia’s manufacturing facility in West Point, Georgia.

Drivers Wayne Gerdes and Chris Bernius drove a factory-standard 2011 Optima Hybrid sedan, beating the car’s official highway fuel consumption figure by 61.37 per cent. To comply with Guinness guidelines, the vehicle had to carry two people and their luggage throughout the trip.

Connect with Autos.ca