Ran benchmarks last night but during a 20 minute charging session, a front passed through. The temperature dropped 6 F and wind direction changed and blew stronger. This would have significantly impacted the last, 75 mph test. I won't speculate on the effect but it very likely impacted the second, 75 mph pass. Regardless, this is what my preliminary data shows:
These results suggest at least a 5% improvement in high speed performance at 65 mph which also increases the range. Since my battery has a -10% degradation, it looks like half of the lost battery capacity will come back.
I plan to paint the covers flat black to match the tire rubber. This will also mask the 'rough finish' of these prototype covers.
Bob Wilson
ps. I will post additional details about how I made them.