The HyBoost project is a collaboration led by Ricardo that'll lead to a 2.0-litre, sub-99g/km CO2 car.
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.