Having owned the 1.6tdci engine in its 90bhp form in an 07 and 58 plate Fusion I would not be overly concerned.
My 07 car arrived with 10,000 miles and was sold 12 months later on 34,000 miles with no problems. My 58 plate car was bought last July on 9000 miles and sold last week on 25,000.
At 22,000 miles the engine is barely run in andI would anticipate you seeing the mpg improve from 24,000 miles on.
57 Titanium 1.6 110 DPF, X Sport pack, panoramic roof,Sony 6 CD changer with voice control bluetooth.