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Looks like a good find on the chart and a good strategy. i would accelerate with vacuum in the 3 to 6 range up to 2700 to 3000 rpm before shifting such that the revs don't drop too far below the first torque peak (at 2300) after the shift, until getting up to cruising speed, then shift into 5th gear and pulse and glide and stay off the brakes...
This approach minimizes the time of the acceleration phase yet operates in the most fuel efficient range while accelerating. 5th gear cruise runs at lowest rpm for the speed and uses less fuel regardless of the reading on the vacuum gage. Other folks like to accelerate slower or shift sooner, so you could experiment with different launch schemes and measure the fuel usage. i've had 20% improvement using this technique, ymmv.
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