The Australian couple of Helen and John Taylor have beat their own record (58.8 MPG) with a 67.9 MPG run around the 48 contiguous US states:
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The pair has over 80 fuel economy and driving records. In order to achieve their latest record, Helen and John drove the same vehicle they used to set their record in 2008, a 2009 Volkswagen Jetta TDI. The only difference: the Jetta was outfitted with Goodyear's Fuel Max tires this time.
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Source:
Australian Duo Breaks Guinness Fuel Efficiency World Record – Automotive News & Car Rumors at Automobile Magazine