55-60 is about the best, at least on flat terrain. I have not made any graph comparisons to RPM vs. Economy. I have just been monitoring the instantaneous fuel economy vs speed.
Funny thing though, I lost about 1/2 mpg after installing a set of vent covers on the roof.
I would not have thought that would have made much difference, or perhaps it's just the different roads that I drove on since putting them on that makes me think I lost that much.
Or it could be differences in temperature or a myriad of other factors that accounted for the drop in mileage that I detected.
Right now though, the EcoRoute HD is on the fritz. We were about 250 miles from home when it reset itself. I got kind of paranoid so I unplugged it from the vehicle... I probably was safe, but I didn't want something potentially burning out my computer when I was far from home.
At that point, I had been using it for a couple months with at least 2,500 miles on it. So I am sure it was just a hiccup in either the module or the Garmin GPS - which is kind of flaky anyway.
I just have not taken the time to set it up again. But I will when I start hauling my toad around as I want to see what the difference is.
As for the vent covers, methinks I will buy some of those air tabs and put a couple of them on the top of the covers (and elsewhere) to see if indeed I am losing gas mileage.
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