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depends alot on the car and the gearing. My SHO with auto got the best milage at 77 indicated. About 200rpm above the low rpm torque peak.
My truck gets its best milage at 50mph.
Most of the subaru's I've had were geared so low 55mph is about the peak. The STi would hold its 26mpg till 80 or so, but there is like 0 varience in that range. I think its the turbocharger removing pumping losses as the load (drag) increases that makes it not lose much/any in that range. Well and moving to a more efficent rpm.
never drove the SVX that much, but it seemed dead stuck on 20-21mpg regardless of how/where I drove it. Its likely not representative though as its 180,000 miles old and it got its factory origional fuel filter changed when I got it at said 180K miles.
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