After changing jobs, I revived my commute time data collector for my new commute. The end-result is much the same, e.g., Google Maps underestimates the commute time by an average of 20%. The range of underestimation (from the average time) was from 4% to 48%.
I programatically collected Google Maps estimates for a few days and averaged them, while manually collecting my actual commute times. The morning commute looks like this:
The evening commute, like this (don't ask me why Google spreadsheets chose a different display format):
The underlying data is here.
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