2004 Prius Lifetime Mileage Chart - almost 2 years

2004 Prius
Bought: 3/1/04, currently has 28k miles.
Location: Seattle
Normal use: 50 mile round trip commute, freeway at 60-64 mph

Here's a chart of my lifetime MPG performance (calculated, not by the display).
The red is per tank mileage, so it jumps around depending on how good I was at filling the tank.
The blue is a rolling 4 tank average that tends to smooth out those deviations and shows the true running MPG. It's interesting to note the seasonal variation (I live in Seattle).

The whoop-de-doo in late December 2005 is from the ECM recall. The next tank sucked.

I keep thinking that the mileage is dropping with age, but this shows it's probably just the weather. We'll see what it does this summer.

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No new tires yet. 28k and still lots of tread, as far as I can see.