10: SMART Fortwo Cabrio
CO2: 113
Price: £10,500
With their heavier frames for safety and structure, it's surprising any open-top cars made this list. But we can fully recommend this Smart, since it emits so little CO2 and only costs mite over £10K.
You can see more low CO2 cars by class on the government's Best on CO2 site. Or head on over to our Transport reviews to brain up on the latest, greatest green cars.

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Anonymous 25 July, 2011 07:00
It is good collection of some really very cheap cars. But it's good if you have posted all on one or two pages instead of refreshing the page every time.