I saw a 1.5L turbo VW get 79mpg..on Top Gear.
Of course it was running about 35 mph on the European expressways.
Of course, if you're talking the original BBC Top Gear show, that's just under 66 miles per US gallon.
By the way, one thing I want to see--hello, Car and Driver!--is to take a Ford Fiesta ECOnetic and a Volkswagen Polo BlueMotion super-efficient models sold in Europe and subject it to the EPA 2008 fuel economy test. I'll bet even money that the fuel economy results will be disappointing compared to the European test results, since the EPA 2008 test is much more "real world" than the fuel economy tests done in Europe and Japan.