The Vauxhall Astra 1.6 CDTi Elite Nav is a highly specified version of the popular Astra hatchback. It combines a punchy, highly economical diesel engine with a premium, winter-friendly cabin.Here is a quick overview of what you need to know about this model:Engine & PerformanceOutputs: Available in 110 PS (108 bhp) and 136 PS (134 bhp) options, with an extra-powerful BiTurbo 160 PS variant also produced.Fuel Economy: Highly efficient; returns roughly 55 to 72 mpg depending on your driving style and exact engine version.Road Tax/ULEZ: Models registered before April 2017 often fall into a very low tax bracket (as low as £20-£35). Most 1.6 CDTi units are Euro 6 emissions compliant, making them ULEZ/CAZ exempt.