2012 Maxima SV-I've had the car for 5 months and the MPG display always shows 22.5 MPG. Has anyone else had the same problem? Any solution?

2012 Maxima SV-First oil change-car manual mentions either 5W-30 API SM oil or Nissan Ester engine oil. What are the pros and cons of each? Is there anything unusual about the oil filter that I should be aware of. I will be taking the car to a dealer for the first oil change (so it can be offically recorded) however after that I would probably do it myself.

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2012 Maxima-any idea when the Metallic Slate color will be introduced? The brochure I have indicates late availability.