I have looked through a lot of the available information people have offered up on forums and it was really helpful to find the EPA test data showing the 54.5kW battery. I have a SR+ with 1000 miles 18" w/aero. My rated watts/mile on the energy consumption screen is 225 watts per mile. When I charged to 100% last week and switched to miles it displayed 236 miles so according to the car that calculates to (236*225)=53.1kW. If it had shown the 240 range then my calculation would indicate a 54kW battery. I have been charging to 70% as my commute is only 50 miles total so I'm not sure if my battery needs balancing at a higher charge so the range miles grow when at 100% but I'm not going to sweat 4 miles for now. Tesla Range Table - Teslike.com This table seems to be fairly accurate as I have been comparing values and find them to be pretty close to what I see when I encounter the "ideal" senario this chart is meant to indicate for my model. My life time average is 230 watts/mile and my data suggests that travelling a constant 67mph on a flat road with no wind at mild temps would give me my rated range of about 240miles.