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One of the things that surprised me about the car/graph was the point of best fuel economy at 40 km/h.
That speed happens to be pretty shortly after the transmission shifts into 3rd gear (of 4), so the engine is turning fairly slowly. It surprised me because it's the first speed vs. fuel consumption graph I've ever seen where the best performance isn't in top gear.
You can tell from the graph that the shift from 3rd to 4th (with torque converter lockup) happens between 60-70 km/h (shifts right in the middle at 65 km/h or 40 mph, actually).
It's possible to bleed speed down to 60 km/h and then hold 4th gear there, which would have raised that MPG point on the graph quite a bit, but I didn't. The transmission will downshift at the slightest prod under those conditions.
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