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So I hooked TorquePro and looked what is going on.
at 73-75MPH RPM fluctuate in 2,200-2,600 range
at 62-63MPH RPMs are in 1,100-1,900 range.
Looks like Toyota cut costs by simplifying Prius C intake valvetrain, and it is not optimized for higher RPMs.
So increased aerodrag is getting ICE out of optimum range and causing sharp MPG drop. I suppose aeromods and better LRR tires are needed if you want to improve MPG.
EDIT:
From read up: Prius C is equipped with VVT-i on intake, which is similar to Honda VTEC in the sense that it switches from one cam profile to another and it looks like at higher lobe ICE isn't as efficient. From observing RPMs engine likes to hang onto one or another RPM range, so ECU is probably programmed to minimize switching.
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