Mondeo's are notorious for their injectors going between 60k and 70k , mine luckily enough lasted till 148k due to motoway mileage .
I'd get along to a proper delphi agent , have the injectors taken out and put on a flow test and you'll know one way or another .
My car needed 4 new injectors and total cost was £692 after labour and recoding and removal and refitting and the car is like new now .
Good luck , check out www.fordmondeo.org as well