bubbles 
2004 Toyota Prius Hatchback 4dr Hatchback (1.5L 4cyl CVT)
Over 24,000 miles with lifetime avg...
 Lifetime average (calculated by keeping detailed records) is just above 54mpg and has improved over the first year's use.  Only change we've done is to use synthetic oil.  We have not babied this vehicle and drive it on short errands as well as long trips, cold weather and hot.