Kris Holt Contributor Share on Twitter Kris Holt is a contributing writer at Engadget. More posts by this contributor Amazon opens pre-orders for its Halo View fitness band Peloton sues rivals over alleged patent infringement related to on-demand classes Formula E has announced what it claims is the planet’s most efficient race car. Teams will…

Formula E says third-gen vehicle will be the world’s most efficient race car