The Mercedes C-Class is unique among plug-in hybrid estates in offering buyers a choice of petrol-electric or diesel-electric power
The Mercedes C 300 hybrid is the only model in its sector with the option of diesel-electric power – and it's a great combination
The Tesla Model S remains one of the most desirable electric cars you can buy, but its qualities come at a substantial price
The latest BMW 3 Series plug-in hybrid is a very accomplished all-rounder, combining driving enjoyment with ultra-low running costs
It's good-looking, efficient and technologically advanced, but the Audi A7 TFSIe isn't quite impressive enough to justify its pretty high price tag
The latest Mercedes E-Class hybrid is available with petrol or diesel power, and is a comfortable alternative to the sportier BMW 530e
The Ford Mondeo Hybrid has been overtaken by more up-to-date rivals and will really only appeal to company-car users
