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The ideal course for maximum mileage would have consistently rolling terrain that allows extensive engine-off coasting. It's too steep if your car coasts up to unaerodynamic speeds while you're descending, and it's not steep enough if you have to turn on the engine on the downhill.
Yesterday's flatter course contributed to our lower average MPG, but so did winter blend gasoline and lower ambient temperature (colder tires, denser air). There were a few more stop signs, and the fact that we sat at a few red lights meant we had to make up the time driving faster elsewhere.
It was a very scenic course, and there was much less traffic than last time.
I also liked the way the midway checkpoint was done. We were all allowed to stop, and our time in and out was recorded. As I see it, the only fuel economy disadvantage to stopping longer is your engine and O2 sensors cool down while you enjoy the scenery.
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