John and Helen Taylor, the Australian hypermilers who made news in the United States in 2009 by averaging 67.9 miles per gallon in a tour of the 48 contiguous states, recently added another record to their considerable tally. The couple drove 1,626.1 miles in a 2012 Volkswagen Passat TDI SE from Houston to Sterling, Va., breaking the Guinness record for the longest drive in a passenger car on a single tank of diesel fuel.
They departed May 3 and passed through nine states, averaging 84.1 miles per gallon during the excursion, and finished on May 5.
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