Britain's greenest cars

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Greenest 4x4s: Lexus RX400h

The standard 3.0-litre version of the Lexus off-roader produces 288g/km of CO2, but the 3.3-litre RX400h reduces that by nearly 100g to become one of the greenest off-roaders you can buy.

How? This RX uses a battery-supplied power system, much like that of the Toyota Prius, to give a boost to its 3.3-litre V6 petrol engine.

The two electric motors can even take over completely at urban speeds, resulting in eerily silent motion. As with other hybrids, the battery pack is recharged via braking and this helps to improve economy from the RX300's 23mpg to nearly 35mpg.

Otherwise, it's the same well-equipped, five-seat 4x4 as its conventional brother, except that the combined battery/V6 kick cuts the 0-62mph time to 7.6sec.

Price: From £35,480
MPG: 34.9
CO2 emissions: 192g/km

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