A hybrid passenger car modified by NREL researchers is cruising at 100 miles per gallon (mpg) and generating international notice as fuel prices soar to record levels.

The experimental plug-in version of a 2006 Toyota Prius sedan runs the initial 60 miles mostly on battery, with the remainder achieved under engine power.

The sedan’s performance more than doubles the fuel economy of a standard Prius, which is rated at 48/45 mpg. And, it’s a five-fold improvement over the 20 mpg average that passenger cars and light trucks in the U.S. achieved in 2007.

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