Good Cruise Control
I've rented 100's of cars and the cruise system on the XF is one of the better ones.
1. Unlike a lot of cars, you don't have a power button to push first.
2. The 4-way lever is positioned perfectly (imo) and is easier to work than most steering wheel controls (again imo) though at first, I would set it when making left-hand turns.
Perhaps it makes up for a lousy wiper delay system.
It's used constantly to save gas and avoid tickets.