As a diesel-powered plug-in-hybrid SUV, the Audi Q7 e-tron occupies a niche within a niche within a niche. It could be seen as evidence that Audi?s product planners are determined to find the least-populated space in the great automotive Venn diagram. There have been diesel hybrids before in Europe (notably Volvo?s V60 PHEV) but never one this lar...
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