Según George Achorn de Fourtitude.
"Think of the S4 as it is now. However, drop Audi’s new chain-driven 4.2 TDI under the hood and badge it the ‘DS4’. The car would look and handle like the current S4, and we know by seeing the performance of the A8 4.2 TDI that performance wouldn’t be far off of the petrol S version. Even better, the larger and heavier A8 4.2 TDI gets 30 mpg, well above the S4’s North American rating of 21 mpg."
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