While this article is a little out of date, it demonstates what's possible. Imagine that with fuel consumption being a mere 0.99 litre per 100 kilometres, a 6.5-litre tank will produce a range of some 650 kilometres without refuelling. The test vehicle, in one test, produced 0.89L fuel consumption per 100km.

Electric cars hold great promise as well, but they won't be too viable for those who live in northern climates, where a heater/defroster are important. The VW tech is here now.

https://www.volkswagen-media-service...tlichkeit.html