The lug nuts on the Ford Fusion are known to swell to greater than their original size. When these lug nuts swell, the lug nut wrench will no longer fit, so they must be drilled or extracted. 

The lug nuts swell when they have been tightened too tight. To prevent this condition, only tighten the lug nuts with a torque wrench. If changing a flat on the road, the lugs should be loosened and tightened to specification at the earliest opportunity.