July 10, 2007 Mercedes-owned smart is set to become the first mainstream production vehicle with a full complement of alternative drive systems. It has begun touting four new versions of the smart fortwo, all of which can be expected in production form before the year is out. We’re not sure which is the most exciting as they all offer different solutions depending on your needs. The cleanest of the new smarts is the 30 kW plug-in electric version with a range of 115 kilometres (EUDC), but there’s also a 100 mpg 53 kW diesel hybrid drive, a slightly less economical petrol hybrid for those who don’t want diesel, a 52 kW micro hybrid petrol variant and a diesel-engined fortwo which will become the world’s most economical combustion-engined production car with 85 mpg (3.3 litres of fuel per 100 kilometres - NEDC) and the ability to travel 1000 kilometres without refuelling. The smart fortwo diesel is the world champion in low CO2 emissions at just 88 grams of CO2 per kilometre. This is huge news.