6 Speed and I haven't gotten better than 13.9 mpg (yes I do the math correctly). I have tried all the suggestions mentioned by you helpful and knowledgable people to no avail. I have a 9 mile city commute and it's been cold. I'm going to see if my dealer has any answers.

If not for this issue, I love my car.

 

One point data here. When I picked the car up, the salesman filled it and I have no idea if it was really full or not. When I filled it, I started tracking the mileage. I got 15.9 mpg over the past 3 days of breaking in the car. I'm DARN pleased with 15.9 given that the car is new and I was totally new to a MT when I started driving the 8 on Monday. The temp has been in the 40 to 55 degree F range and the driving has been on roads near malls with more than a desired amount of stop-n-go driving. Maybe 30 percent of the miles were unfettered freeway driving. Like I said, so far so good. I'll check in again after my next few tanks....