Don't stare at the screen... yet. Get used to the car first then once you're comfortable with the operation (switches, buttons etc) then start honing in on the mileage

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The usual break-in "rules" apply - avoid excessive speeds (I believe it's > 50mph), avoid jackrabbit starts and hard braking and don't tow for the first 1000 miles. For the first 200 miles, don't use the cruise control.
Check if the vehicle is in tip-top condition. Compile a checklist (door, windows, radio, wheels etc etc) so you'll remember what to look for in terms of areas where chips/scratches are most likely to show up.
Check that all the stuff you ordered is there (cargo net, mudguards, wheel locks or what-have-you).
Mods: EV mod, VVT-i emblem, sport pedals, OEM cargo mat, JDM Prius interior footwell lighting, Sylvania Silverstars 9003ST, DICE iPod kit, OEM all-weather mats, TomTom ONE v2, LED licence plate lights.