Interesting anecdotes. My Sequoia towing a 3124KS also has the "sweet spot" at just about 60 mph. It's about 19-20 based on instantaneous mileage readouts on the Sequoia, during flat stretches with the cruise nailed at 60 mph.
I figure that unless I'm in a big hurry (which ain't going to happen while towing) I'll try to keep it in that range of 60-65 much of the time. No doubt a long stretch of days out west would tempt me a little higher, but it's good to know where you get the most from your fuel.
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