I tend to do the same-- I don't check my pressure until I notice poor coasting. Luckily, my morning commute involves stretches of coasting that are extremely consistent when everything is working right.
Interestingly, wet weather is working against me. My longest coasting stretch starts at 50mph or so, and ends at 30mph or so (over about 1km), but when it's wet or my tire pressure is out of whack (i.e., one or more get down to about 35psi), I am only doing about 20mph at the end of that stretch.
The cold weather is also killing my FE, I think, and it's only fall! I've always notices lousy fuel consumption in the winter, but I've never tracked it as closely as I do now.
My last tank was a paltry 36.5mpg. The upside-- It took me three and a half weeks to use ten gallons of gas, and it was entirely in-town driving, so I guess it's not that bad.
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