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Read it like this: at 2500 rpm, best BSFC is from about 60 to 80% of max power. Then roughly translate that to vacuum level for best acceleration. Despite what these charts show, I've found better results keeping to the lower end of the rpm scale, more like 1500-2200 and no higher.
My Scangauge reads vacuum in psi. I like ~12-13 psi MAP for accelerating. 14.x is ambient, so it's nearly but not quite open throttle. Am I right in saying that your gauge reads 30 in Hg = perfect vacuum (below idle) and 0 = ambient = wide open throttle? Assuming so, you'll want to accelerate somewhere in the 5-10 range, and cruise as high as possible (most negative).
You are correct that for cruising you want the most vacuum you can get away with = most closed throttle.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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