I've been doing this for a few years now and I've tried all the combinations of load and rpm. 1500-2000 (sometimes 2200) and 80-90% load (13 psi MAP) is the best for mileage in these Hondas. On flat ground I can gain speed from as low as 1000 rpm, so 1500 is a conservative limit you can stretch and go lower if you like.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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