I've a 2015 D5 AWD Geartronic with Polestar & yes it makes a difference.
Using it in normal auto mode the car has a bit more grunt than standard & is generally a bit more responsive than a non-polestar car (I had a 2012 D5 AWD Auto to compare).
Sticking it into Sport unleashes the beast, the car accelerates with a lot more urgency from low speed/standing starts. At higher speeds the car changes down readily without having to bury the throttle to trigger the kickdown switch.
Mpg impact I've not really noticed a major hit, the car reports about 36-37mpg mixed driving which is around what the previous car was returning.
On a run at a fairly steady speed I'm getting about the same Mpg as well.
I'm glad I spent the £695 to have it mapped when I purchased the car.
The little blue badge also looks great on the Caspian Blue paintwork as well
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Current 2015 XC60 D5 AWD - Caspian Blue
Previous 2012 XC60 D5 AWD - Seashell Metallic
Previous 2005 S60 D5 Geartronic - Gunmetal
Previous 2001 C70 T5 GT Auto Convertible - Saffron
Previous 1999 S40 XS - Silver
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