See the NYT: A High-Mileage Masterpiece
After my long 48-m.p.g. run, I started over and switched personalities, transforming into a late-for-school Autobahn instructor. Never dipping below 75 m.p.h., flogging every curve, the Jetta still returned a reasonable 36 m.p.g. When I flowed with traffic at 65 to 70 m.p.h., and made no effort to goose the mileage, the VW posted 42 m.p.g. And in city driving, the Jetta hit 32 m.p.g, again topping its official rating.
Yet my thrift was no match for Helen and John Taylor. In September, the Taylors, from Australia, drove a production Jetta TDI to a Guinness world record, averaging an incredible 58.8 m.p.g. for a 9,400-mile run through the 48 contiguous American states. The Taylors used just 11 tanks of fuel over 20 days, averaging 850 miles for each tank.
