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Before you start driving more conservatively, I wanted to point out that the energy lost in accelerating a mass to a given velocity is the same whether you do it slowly or quickly. The POWER required to accelerate faster is the difference. Your batteries store energy, so as long as your accelerating to the speed you want, (not going faster, then slowing down) it shouldn't matter how fast you accelerate. I've been waiting to bring this up in a forum to see the reaction of the people responding. For an electric car the extra losses from accelerating quickly would be related to additional I^2R losses since you driving more current to get that faster acceleration. I don't know how much that is in these motors. It might be that there isn't that much range penalty for having fun with an electric car. You really need to get an accurate assessment of the wh/m number at 50 mph. You mentioned you where doing the measurement on a road with a slight incline. Even slight inclines make a big difference. I do my measurements going both ways on a road, then average the results. My controller (soliton JR.) can log this information while I drive. That is one way to measure it. You can check out my site to see how to measure your coefficient of drag doing coast down tests. I have a spread sheet there to help. If it is confusing just contact me. I'd be glad to help. Those wh/m numbers seem too large to me.
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