And very odd but interesting results from last tank. 2 tanks with a 20-30 degree departure angle taper at 14.44 and 14.31mpg. This one with a supposedly better 12 degree angle...13.79mpg. So I'm leaving it alone and running another full tank to be sure the result isn't a fluke.
The only other thing I changed between the 2 tanks and the latest, is that I increased the tire pressures from 35/45 to 50/60 F/R. I can't see FE being worse with higher pressure, in general. But I know that on bicycles there is a point of inversion, where the rolling resistance starts increasing above around 130-140psi. So it's unlikely but possible. If the next tank is also ~13.8 I might drop the tires back down to confirm that there's no substantial difference.
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