It's the norm to be 'eco' these days; every face-lifted or all-new model pumps out less CO2, as makers work towards stringent future emissions regulations.
Here, though, we credit those cars that are not the norm; the models that move the efficiency game on, whether that's by getting ever-lower CO2 from a combustion engine, making electric motoring more accessible, or introducing technology.
If it adds a dimension to eco-transport, it could win our green award.
|Claimed range||80-100 miles|
BMW i3Best buy £20,000-£30,000
The i3 brings more than just a premium offering to the mainstream electric car scene.
|List price (after grant)||£25,680|
|Target price (after grant)||£25,680|
|Claimed range||130 miles|
Renault ZoeBest buy Less than £20,000
The Fiesta-sized Zoe is one of the most affordable ways into electric motoring. It offers similar running costs to a diesel-powered Renault Clio, and that's before you consider that free of company car tax.
|List price (after grant)||£13,995|
|Target price (after grant)||£13,995|
|Claimed range||310 miles|
Tesla Model SBest buy More than £30,000
If anything, the all-electric Tesla Model S feels more brilliantly extravagant on the road than any of its diesel- or petrol-powered competition.
|List price (after grant)||£68,700|
|Target price (after grant)||£68,700|