The Astra has a number of efficient and cheap-to-run engines available. Earlier cars are slightly more expensive, tax wise, than their later incarnations. 1.3 CDTI cars are £20 to tax and do 67.3mpg; 1.7-litre CDTI 123bhp and 2.0 CDTI 163bhp versions both cost £115 per year in road tax and are capable of 62.8mpg and 61.4mpg respectively.
Later, facelifted Astras were fitted with the new 1.6 CDTI engine, which reduced the road tax and fuel consumption figures. They come in two power outputs, with both achieving free road tax. The 108bhp returns 78.5mpg and the 134bhp manages 76.3mpg.
The petrol engine range is smaller than the diesel range, with the most prevalent being the 1.6. In manual form, it achieves 45.6mpg and costs £150 per year to tax. The 1.6 is also available as an automatic, which reduces fuel economy to 39.8mpg (38.7mpg for higher-specification versions) and increases road tax to £220 per year.
Running the VXR will set you back a fair bit more because of its £280 tax bill and 34.9mpg economy – this will drop much further if you indulge your right foot.
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