On the same topic:
Most following this thread are probably aware Ford released a software update for the C-Max hybrid meant to help it get better "real world" mileage. Among other things, it increased the speed at which the car could drive with the ICE off.
Now we learn they've also been modding the physical car itself. 2014 versions ...
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- include a "more efficient" ratio for the final drive,
- updates to reduce aerodynamic drag from the hood seal, tire
 air deflectors, windshield-pillar moldings, and tailgate.
- Ford will also use lower-friction engine oil in 2014 C-Max Hybrids.
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source:
2013 Ford C-Max Hybrid Owners Get Cash As Ford Lowers MPG Rating