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Congrats on a fine vehicle, Kevin. I drove my brother's for over a month while dealing with my dead car crisis and found the HHR to be one sweet ride.
Sounds like you're on the right track with your driving style, and I agree with Daox: Your numbers can definitely get better yet. I was getting about the same on my brother's HHR, and it's an automatic (but I've been hypermiling for years).
Granted there's an MPG function in the DIC, but that's only telling you a tiny bit of the story. A Scangauge II (or an Ultra-Gauge if you need to pinch pennies) will give you a wealth of information. Something as simple as learning your throttle positions can make a huge difference. You'll want to monitor temps when you install your grille dams. Then will come the day you decide to experiment an HAI, and so on. It's really a worthwhile investment and will pay for itself in fuel (not to mention self-diagnosing and clearing trouble codes.)
Regardless, have fun and good luck with your gas-saving efforts!
Rick
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