I've been driving the Lexus CT200h for about 14 months. In that time, I've used 474 gallons of unleaded regular grade fuel and driven 24,372 miles, thus realizing an aggregate fuel economy of 51.4 m.p.g. The maximum I've achieved on a tank full is 54.7 m.p.g., and the minimum is 45.7 m.p.g. The standard deviation of my m.p.g. for each tank full (not weighted by distance driven on that tank) is 1.99 m.p.g.
The graph below shows my mileage history. Click on it for a larger view.