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I realize you feel you are driving it the same way as before. We have all been there. But without good gauges to monitor average speed, throttle position, engine load %, and other factors and without a clear indication of how you did your fueling each time there are simply far too many variables. Further variables: average daily temperatures affects fuel economy. Imperceptible changes in foot position can have significant impact on engine load. Small changes in average speed can adversely affect average fuel economy. Put a few of these together and you can rather easily account for your drop in FE--even though you feel like everything was the same. If you want to see for yourself, buy a fuel economy gauge for your OBD2 port, such as an UltraGauge or a ScanGauge. Buying one of those might be the best money you invest. Used well, you will get its cost back after a few tanks.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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