The new model, which is available in Hatch, Sport Hatch and estate guises, falls into the lowest BIK tax band for company car drivers, while private buyers will only pay £35 per year in Vehicle Excise Duty thanks to its band B credentials.
But the Astra 1.7 CDTi ecoFLEX has not sacrificed driver involvement to go green. Its engine produces 110PS, an increase of 10PS over the existing Astra 1.7 CDTi, and 260Nm of torque at 2000rpm, enough to power the ecoFLEX to a top speed of 117mph.
Vauxhall's engineers have achieved extra efficiency from the Astra's 1.7 CDTi drivetrain by fitting a taller axle ratio, optimising the engine management system and reducing the engine's idle speed.
In addition, ecoFLEX's kerbweight has been reduced by 30kgs, while aerodynamics have been improved by lowering the suspension, modifying the front air intakes and fitting a drag-reducing lower engine compartment panel. Engineers also reduced the power steering pump's idle speed and fitted low rolling-resistance, 15-inch tyres (16-inch optional).
In 2009, Vauxhall will introduce two further ecoFLEX models: a 109g/km Corsa 1.3 CDTi with combined mpg of nearly 69mpg, and a low-emissions version of the Insignia which is set to make a stir in the mid-size sector.