The technology to make motors efficient has been around for a century, not much has changed there besides controls and feedback. Engines on the other hand have

The technology to make motors efficient has been around for a century, not much has changed there besides controls and feedback. Engines on the other hand have greatly benefitted from modern control systems. Here is a primer on motor history: https://www.eti.kit.edu/english/1390.php https://www.eti.kit.edu/english/1390.php And http://m.hpac.com/motors-drives/understanding-efficiency-motors http://m.hpac.com/motors-drives/understanding-efficiency-mot...