I would chalk a lot of it up to the cold weather. I know how it's been in Illinois, and cold weather just sucks for fuel economy. I've been doing a lot less long distance driving now that school is out and my tank averages have been getting lower and lower.
Also I get similar mpg readings before warm up, I'm not exactly sure about how long this usually lasts though. But I've become accustomed to my drive and know where the point is that I'm usually warmed up, and recently I haven't been getting far past my combined mpg of 24. My drive is about 40 minutes of mostly 55-60 mph driving, however on the weekends I do most of my city driving and I can barely reach my 21 city on the shorter trips. It's just like I said earlier, winter sucks for mpg.
Last edited by AbeisAverage; 12-25-2012 at 01:00 AM..
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