It's a 10 mile commute. I don't warm up the car, just crank and go.
Here's the graph in question. The blip at low temperature is an artifact of having only a few data points down there. It's smoother in the middle where I have more data. This graph covers 2 years of driving.
Here's an updated one that covers 4 years of driving. The data points are smoother, and the linear temperature/mpg trend is clearer.
