ANALYSIS: TDI technology at the core of Audi’s powertrain strategy

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High-tech TDI engines that provide economy and performance sit at the heart of the Audi brand's values and technological DNA. As Audi marks a quarter century since it debuted TDI, Calum MacRae takes a look at Audi's strategy to develop TDI powertrain technology further to meet tighter future CO2 emission targets and the need for still higher efficiency from internal combustion engines.