Moffiler, David is driving a 2007 Honda Civic, and is new enough to have DFCO. Coasting in gear, or using "engine braking" will take advantage of that and most definitely save fuel. See tip #44 in the "100+ Hypermiling Tips" (link at the top of the page).
David (Welcome to EM!); I echo what others have said about winter sabotaging your efforts. Although 12% is nothing to sniff at! Keep at it, and come spring you'll surely be rewarded with better results.
Make an entry in the garage (see link at the top of the page) for your car and start logging fill ups. It really helps to see it graphed out. Good luck!
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-Terry
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