Eco echo

This button on the Prius and some other Toyota and Lexus hybrids is meant to activate an electric-vehicle mode that allows for gas-free acceleration. Only it doesn't: In actual traffic, Prius accelerates more often on gas power but turns the engine off frequently when coasting. Prius delivers an EPA estimated 50 mpg, but the button is just taking up space.
Copyright © 2018, Los Angeles Times
EDITION: California | U.S. & World