A fast-rising name in the hybrid vehicle market, Horse Powertrain has spent the past three years transitioning into one of the world's leading engine manufacturers while developing a portfolio of electric motors, hybrid powertrains and other net-zero-supporting technologies. Now it's looking ahead into the future, showing an early concept version of a next-generation hybrid engine system powered by 100% renewable fuel. The company says the new prototype can boost fuel economy by 40% while slashi...