Three new low-emission Astra Ecoflex models have joined the range, all offering drivers the lowest possible diesel tax bands.
The Ecoflex Astra models, available in estate, three and five-door hatchback guises, are powered by a 1.7-litre CDTi diesel engine producing 110bhp and capable of returning average fuel economy of 62.8mpg.
They fall into the lowest 13% benefit-in-kind tax band for diesels.
Prices start at £16,340.
The Ecoflex Astras join the existing Corsa and Agila low emission models, both of which are sub-120g/km of CO2 cars.