How much does it cost to go ice skating in France's most festive village? And to buy a handmade glass ornament in Switzerland or enjoy homemade pasta and white truffle in a small village in northern Italy? And what's more, is it possible to enjoy all these experiences thanks to fuel savings with a CNG car? The answer lies in an unprecedented challenge: four European countries, an Arona TGI and a 2,611 kilometre road trip.