The 55 mpg was a push it to the limit tank.
During the summer I was running 3 tank averages of just above 50 mpg for about 2 months and even if I wasn't pushing it 48 mpg was easily to get.
Now that it's winter I am seeing lower mpg from not only winter gas, air temps, but also not EOCing as much due to cold engine, wanting the heater on, battery charge, etc... but even with all that I'm still running low 40's tanks with a car that is rated at 29 mpg average.
My estimates of how many mpg's a mailbox stop takes up were just a guess for the effect of an entire tank and were not come to by scientific method and multiple batches of incidents. It was meant to say that little changes add up.
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Lifetime mpg
2012 mpg
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