Citroen has cut emissions for the C3 Picasso 1.6 HDi, now offering 119g/km and 63mpg.
Used car buyers will now be able to see how 'green' their next car will be at a glance.
A Suzuki Alto has achieved a staggering 141mpg during a special fuel economy marathon.
A government committee has suggested that the motorway speed limit should be reduced to 60mph.
Brighton is to play home to 20 roadside charging stations over the next 12 months.
Mazda will unveil a range of low-emitting, low-consumption engines at the Tokyo Motor Show.