It looks like you are shifting optimally. In theory, you want to accelerate "briskly", meaning not maximum acceleration, but not slowly. Of course while cruising at a constant speed you want to be in the highest gear the engine can handle for that speed.
I never saw particularly good mileage with my diesel Beetle until I started accelerating then coasting. This works well for me as there are lots of hills where I drive.
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I'm not coasting, I'm shifting slowly.
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