Before I broke it, mine was at 118,500 miles and was getting (according to the trip computer) 7.2l per 100km / 37mpg on the motorway.
Ran smooth as silk, though it had started to complain about cold mornings (prolonged winter temps of -10C are the norm here and we barely broke into 'plus' figures at all this season) and if it was driven for less than 15 minutes on a cold day, it took a few seconds of hesitation before it fired up again.
The replacement Cougie at @ 72k miles is barely getting around 9.5l per 100km / 29mpg, though there may be some disk rub from the new front disks & pads contributing that that dreadful figure, plus it looks to have been standing idle for about 6 months at the dealer's yard...