Went into my local dealer today to ask exactly that. Cleland Volvo, Galashiels, Scottish Borders.
I basically explained that I want to be going along in eco or comfort, but then if an opportunity arises to pass something slow moving on an A road, I don't want to be faffing with selecting a different drive mode. The service manager told me that it is effective regardless of drive mode and is designed for exactly that purpose - mid range punch.
I'm booked in for 17th August, T4 petrol - and he's doing it for £500.
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S90 R Design T4 - Polestar Optimised
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