Exactly, and here's a good example of how the driving behavior comes into play: right now our weather is around 40F and my estimated range was around 65-68 (don't use HVAC much), but after 3 driving sessions by my wife and daughter that covered a total of about 70 miles (different driving style and they do use HVAC much), today I got in the car and the estimate had gone down to 55 (about 20% less) with the same outdoor temp.