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Message: <blockquote data-quote="70srocker" data-source="post: 25375" data-attributes="member: 9382"><p>I found the issue. Yesterday I typed in Google, “can gas mileage go down after an oil change”. The answer was yes, if the wrong oil was used or too much was put in. I checked the dipstick and it was an inch over the full line. I took it back to the Chevy dealer who changed the oil and they figured out they thought I had a AWD. It takes almost a full quart more than a 2 wheel drive. They drained the oil and filled it back up. Now getting 25.8 mpg.</p></blockquote><p></p>