You don't say how old the car will be but even so, out of those three I'd get the Mondeo.
My (old shape) 54 plate TDCi did 130,000 miles before I sold it without a hiccup . As it was more often than not on the motorway, it averaged about 56 mpg with motorway – the amount of town driving I did.
It was large enough in the boot too, hatch and could be thrown into bends with that nice feeling that you'd make it round.
Also consider an Octavia. Now I have a VRS hatch and I'm well pleased. Rapid, handling motor, not quite as large as the mondeo but more fun. Not bad on the jiuce either with it looking like returning 50+ at this stage.