I wouldn't think I would get 39 mpg above 70 mph. I don't have a "ScanGaugeII" though. It's on next year's xmas list. I can cruise at 70 mph with 2500 RPM. Going around 80 gets me almost 3000 RPM with current gearing.
I do about 80% highway and 20% city for 32.5 mpg / tank. Best guess from asymmetric tank and odometer is about 40 mpg driving 65 mph.
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