Hypersecretion - Too much of any hormone secreted into the body is usually caused by a secretory pituitary gland tumor. Secretory tumors produce too much prolactin (the hormone that triggers milk production in new mothers), which leads to infertility, discharge from breasts and menstrual abnormality.
Roadster uses about 230Wh/mile at 55mph, we know that Model S 85kWh battery should last 300 miles at 55mph. That gives us 283Wh/mile. Difference is 53Wh. Roadster uses about 330Wh/mile at 75mph, so Model S should use 383Wh/mile at 75mph. 85kWh/383Wh/mile = 222 miles. Estimation, but should not be far from truth.
Unlike a hybrid, they have no gas engine to fall back on and are thus limited to their battery pack's driving range. Models such as the Ford Focus Electric and Nissan Leaf have driving ranges from about 75 to 107 miles; the much more expensive Tesla Model S can go nearly 300 miles.