Audi A6 Pricing And Specification Manual page 8

TDI and FSI
Inside the Audi A6 you'll find the same
advanced fuel-injection technology that's
driven us to win after win at Le Mans. With
TDI and FSI, fuel is injected directly into the
engine's chambers so that combustion is
timed right down to the millisecond. As a
result, waste is minimised and you get the
most from every last drop of fuel.
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