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I think the thing with the Subaru comes down to the SOHC engine. The torque is relatively flat from 1800-3200 RPM. The HP only climbs from 100 to 110 in that range. So going anywhere from 50 to 75 in those RPMS really has a minimal effect on the fuel consumption.
@euromodder
You are most likely correct a majority of the time with your 4th gear statement. Alot of engines hit a peak effciency not at the lost rpm/tallest gear, but at a point where the engine produces the most while using the least...there is a point of "increasing at a decreasing rate" where you still gaining better economy but you can quickly cross the line.
Some of this goes back to the Ford circle race with the new v-6 Mustang. They averaged 40-something MPG, but the engineers paced the car at the peak to the most out of it.
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