Some semi-relevant observations from my Odyssey this weekend. I took a highway trip 200 miles each way, and averaged 33 mpg round-trip (woohoo!).
~45 mph is the best speed for mpg.* I simply wasn't seeing that efficient plateau at 35 mph. I could be holding a 35 mpg segment, and a light would force me into lower speed mode. I tried holding 35 mph for a while, and the average would tick down, down, down until I popped it over the 5th-gear-lockup point at 45.
* dealing with hills and terrain, 55 is better. I can then keep it locked in 5th all the way up, while dropping down to 43 mph or so. Starting any slower would require a downshift somewhere on the way up the hill.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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