There is often much discussion regarding the rated miles being affected by influences such as driving style, weather, terrain, etc. Isn't this really just a measure of available energy divided by some fixed wh/mile (ie. ~289). Perhaps that fixed value varies from vehicle to vehicle based on the battery size, "P" models, firmware, and possibly even wheel size, but beyond that does this value ever change. As far as the other part of the equation (the battery's available energy), I suppose this could be slightly affected by temperature or other factors.