Vauxhall has improved the 2.0-litre diesel engine in its best-selling five-door hatchback by adding Start/Stop technology to the model.
The system turns off the engine when the car is stationary in heavy traffic and helps to save fuel and reduce emissions.
As a result, fuel consumption has been improved from 57.6mpg to 62.8mpg for the British-built model. Vauxhall estimates the Start/Stop technology will boost fuel economy around the city even further, with a 13 per cent increase quoted by the company.
There are also benefits in terms of CO2 emissions, which have been lowered from 129g/km to 119g/km.
This lowers the amount of road tax payable each year to £30 from £95 and puts the Astra hatchback in the 13 per cent Benefit-In-Kind tax band – an improvement on the 17 per cent band it previously fell into.
Vauxhall plans to roll out the technology in all of its efficient ecoFLEX models, including the Sports Tourer version of the Astra and the Vauxhall Corsa ecoFLEX.
The latest Start/Stop system includes a more robust starter motor than previous versions, a high performance battery and an energy management system that allows the battery to be re-started quickly.
Available with a manual transmission, the new Vauxhall Astra 2.0 CDTi model with Start/Stop starts from £22,410 for the SRi model.
Equipment on the entry-level Start/Stop specification includes cruise control, 17" alloy wheels, leather-covered steering wheel, sports front seats, front fog lights, air conditioning and lowered sports suspension.
It is also available in SE and Elite specification in hatchback variation. Sports Tourer versions start from £23,430 and comprise SRi or SE specifications.
The new Vauxhall Astra Start/Stop range is available to order now from UK Vauxhall dealerships.