|It is still a guess but this very lightweight car may become the car hit of 2013 (in a limited edition). The vehicle will be ultra-fuel-efficient with 300 miles per gallon from a small two-cylinder diesel engine in the rear, which is four times as efficient as today’s best hybrids. Since the average American has gained 25 pounds (11kg) over the last couple of years, this car will probably be targeted at European and Asian customers. Brand VW XL-1 Via Arno Twigt