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Did a 40km trip last night, no traffic. Huge elevation changes though, driving down then up the Niagara Escarpment. The highest point was near the beginning at 845 feet above sea level, the lowest point was at about 246 above sea level, and then later I drove back up to 725 feet near the end of the trip.
I reset the trip economy indicator on the car at the start and it said 8.6 l/100km average at the end of the trip which is 27.35 mpg. I was pretty surprised I got that good a result even with the elevation changes. Mustang Dave mentioned in another thread keeping RPM below 2500. For most of the trip it was around 2000. The incline is not as high as the decline, but it's a lot longer of a distance, the first third was the decline, the second 2 thirds were mostly incline with a bit of flat here and there at the end.
I have noticed if I'm on a flat and I can go slowly, at about 42MPH the car gets mid-high 30's with the RPM less than 2000, I think around 1750. The elevations here really don't permit that kind of travel, but it's nice when a trip allows for that.
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