https://www.theguardian.com/technology/shortcuts/2017/sep/11/tesla-hurricane-irma-battery-capacity

The electric-car giant gave customers a lifeline by remotely boosting their vehicles’ battery capacity. But this act of kindness also highlighted that it had been selling identical cars at different prices

Tesla drivers who fled Hurricane Irma last weekend received an unexpected lesson in modern consumer economics along the way. As they sat on choked highways, some of the electric-car giant’s more keenly priced models suddenly gained an extra 30 or so miles in range thanks to a silent free upgrade.