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I'm siding with the weather & ScanGauge suggestions, but others areas might be:
1.) Featherfooting isn't usually the best for fuel economy. You should see a noticeable difference from leadfooting, but the ideal is accelerating under load.
2.) Drive 55mph consistently. Accelerating and deccelerating between 55 and 65mph is worse then driving a constant speed. You should have seen a noticeable change anyways, though.
3.) You may have not been really getting 29mpg with your previous driving style or you might have gotten more than 30.5mpg by ecodriving. You'll know after repeated, full tank fillups.
I would try again for a longer period of time. Even if it doesn't net you any benefits, driving in a more relaxing and interactive manner should be enjoyable. If you see ecodriving as a chore to save a couple of bucks, I think you might be missing some of its more far reaching benefits.
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