...read GM's answer to NHSTA's question #12:
http://www-odi.nhtsa.dot.gov/acms/cs...2V289-6767.pdf
...trading higher tire PSI for increased aero drag due to chopping up the under-engine aero-shield.
Quote:
Q12. GM has talked about the engine shield helps aerodynamics and improves fuel economy. How does the engine shield modification affect Cruze fuel economy?
A12. There is no impact on current EPA fuel economy estimates. For 2013 additional air pressure to the tires will offset any aerodynamic/fuel economy changes.
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