I think you'll find the engine spinning at 1250-1280rpm over a wide range of cruising speeds. This is where the engine seems to settle at under small load conditions. Speaking of engine load, I haven't seen such a high engine load (60) while in the heretical mode. Fifty-five seems to be the upper limit for me. It's usually somewhere in the 40's. I agree with Stan about the fuel consumption. Your ScanGauge should have read somewhere near 90mpg. At 45mph with an engine load of 60, I would expect the SG to read something like 1.0gph not .5gph. I think you were just cruising really efficiently based on your engine load and fuel consumption numbers.