A 2004-2006 Jetta TDI and the third generation 2010 Prius come close to your specs. Both cars will get you 60 or a smidgen more mpg at 60 mph.
The Jetta is a real highway car with it's slightly larger than 14.5 gallon fuel tank. The new Prius comes with an 11.8 gallon fuel tank.
At 60 miles per hour the Prius range is around 650 miles and the Jetta will go a little over 800 miles.
The Jetta would be a little easier to increase fuel mileage through simple aero and gearing mods.
The Prius is very slick to start with and you can do a few Aero mods like rear wheel skirts or grill blocking.
Bang for mpg, the Jetta would be much easier to get to your 60+ mpg's at 65 mph.
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