Looks like I've gotten incorrect info on the 2007 model. I can't find the article now, but when I was researching the differences bet. the 2007 and 2008, the main highlights on the engine differences were the 3.5l is a Ford engine and Mazda had the 3.7l exclusively and also 3.5l takes premium and 3.7l takes regular.
I don't seem to be able to locate that article using google now and the closest I could find is this posted by a forum member. Maybe someone who has an old CR magazine can confirm? Either way the info is wrong.
http://townhall-talk.edmunds.com/direct/view/.f0f04fe
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In the new Consumer Reports 2007 Car magazine it lists the upcoming CX-9 as using premium gas. I was under the impression that the Ford-sourced engine will use RUG. Any firm information...not conjecture, please! Is this an error on CR's part?
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Sorry for the mis-information.