Powered by a 1.6-liter common rail TDI engine with stop-start technology and equipped with low-rolling resistance tires, longer gearing and aerodynamics modifications, the Passat BlueMotion is one heck of an example of efficient motoring and Conway's drive put the vehicle's fuel-sipping abilities to the test. Conway hit the French autoroutes to determine just how far the efficient Passat could travel on a single tank, which holds 20.4 gallons of diesel. During his three-day record-setting run, Conway averaged 45 miles per hour and discovered that the BlueMotion's efficiency was simply amazing. After completing the journey, the Volkswagen Passat clocked 1,526.63 miles, setting a Guinness World Record for the longest distance traveled by a production passenger car on a single tank of fuel; the 74.8 miles per gallon (U.S.) it got ain't too shabby either. VW PR / Auto Blog Green