Zetec-E engine was timed to out of production with C170 Focus.
Duratec-HE is the better replacement.
148PS in standard trim plus all aluminium construction vs 130PS in standard trim with a heavy cast iron block.

The correct question should have been:
Why didn't Ford use VVT technology and coil on plugs ignition and a Denso engine ECU (PCM). Like Mazda have.
The answer would be:
Because that would have cost about $50 per car more and Ford are tight.

Hope that helps
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2011 Focus 3-door Zetec 1.6 TDCi.
Previous <img src="/images/graemlins/stemo.gif" alt="" />s - 2006 Panther Black & 2007 Red. Gone and quite forgotten <img src="/images/graemlins/lol.gif" alt="" />