I tow 1751KG twin axle with my D5 and never use S mode for towing unless its a long downhill when there's a smidge of engine braking or when theres a series of roundabouts, which there are on some of my trips to Norfolk.
Doesn't seem to impact the fuel consumption, which is a consistent 22/23 mpg towing
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2013 model XC60 R-DESIGN Lux Nav Geartronic Polestar in Rebel Blue
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