Give us a brief story of how you did, mods/etc.. Anyways, Congrats!
I've been steady-state high 30's for awhile. It must be the new tires, because I got them about 3 months ago. They are one size up from stock. I use my odometer to track my mileage, and a GPS to correct it (as published in my Gaslog). I will have to update the GPS correction every X number of months, since they will reduce their diameter over time.
Also, I have a "running start" because I have been here a year. Summer's always good times for MPG, and I was "GasSaver trained" for this summer.
I'm jealous. I can't break 40! I've gotten to 39.6 last tank ... stop teasing me. Granted I do 100% city driving, but every time I think I'm going to break it some traffic jam or monsoon rain or some such ruins things.