The car drives like a dream. It's gorgeous. It's possibly the best-designed American car ever. But what the heck makes a Model S weigh over 4,600 lbs? A Mercedes S550 weighs less than this. Even a Chevy Equinox SUV weighs about 1,000 lbs less. I've been talking to a friend who works in the battery group at Tesla. His guess is the batteries weigh between 1,500 and 2,000 lbs. Fine. Where is the rest of the weight? The whole frame is aluminum, which is lighter than the steel typically used in gas-powered cars. There's no engine, transmission, driveshaft, exhaust, firewall, radiator, or other heavy components. There's the motor and the inverter, but I'd have to think they weigh less than 300 lbs each, given the size I've seen in the Tesla store. Any guesses or calculations?