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Your tire pressure, I'm told, should not change revs per mile THAT much (steel belts will only stretch ever so little). If you have a GPS unit, use it to calibrate your odometer distance versus GPS distance. If you don't have a GPS unit, do what I did and head over to ridewithgps.com and plot your commute very carefully and then drive that exact route several times and see what the difference is. Your commute sounds like it's a good candidate. I did this and discovered a 5.5% undercount. I have since checked and confirmed it with a borrowed GPS.
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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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