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Hi Rokeby,
Cd can be better, but the drag worse. The Cd is not that much different between the two. That they could have changed something for the worse, yet still gotten a similar Cd. I think this is the case. Of course, as I have stated, I think its the front slope of the car that is making things worse. One might wonder if the Prius has now been turned into one of these cars with better aero drag going backwards.
The downhill runs were were warp-stealth with the peddle feathered for no regen, and minimum motor.
On the Gen III, its very easy to do this with the accelerator, thanks to the ECO display.
Not so easy on the Gen II. I would feather the peddle so that I was in warp stealth, just above regen.
I have experimented with giving the Gen III significant battery down the hill, and it still does not make up for the difference in speed.
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