I would think a Scangauge would tell you whether EGT is a good guideline or not. But you can directly measure fuel delivery with the LOD gauge, so you would be able to directly measure one gear vs. another that way. I've found the efficiency is best between 1750 and 2000 rpm, if you've got the torque to maintain your speed.
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I'm not coasting, I'm shifting slowly.
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