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Hi John,
I suspect the answer is around 60 Kph (35 Mph) or so as is mentioned above but it seems , from what I have been able to find , the more aero the vehicle the lower the speed at which the benefit is obtained.
I had the chance to get some info from one of the engineers working on the GM Solarcar project and his information suggested the actual benefit may cut in as low as 20 mph in some cases where the vehicles are very streamlined.
Peter.
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