That wasn't clear from the article. Are you saying that the vehicle's range is only limited by the availability to refill with diesel - which is of course widely available in Europe and pretty well distributed in the US?
Yes, same with the Volt. Once the battery is discharged the engine/turbine produces electricity for the vehicle. It's this mode of driving that is quoted for the mpg figures. The Volt 4 cylinder can give about 50mpg. A more efficient turbine could do 80, but I would like to see more data.