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Another idea to ponder. If you had your oil changed recently check and verify that who ever changed the oil use 5w-30 Dexos2 oil. I recently discovered that the the local dealer here in NC put in 15w-40 instead of the required 5w-30 Dexos2 per the owner's manual. This was the 2nd oil change. After the first oil change I was averaging 38-40 mpg and roughly 630 mile/tank. Since the correct oil was put in I have noticed an increase in 40 miles/tank (up to 670 mile/tank). I currently talking to GM to find out what long term affects the 15W-40 will have on the engine but haven't gotten a reply yet...
 
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