Made from 100 % recycled plastic milk containers, this really is the most energy efficient vehicle on this or any planet. (themagicbeantoyshoppe.ca)
We love the fact that they are the most energy efficient vehicle in the world. (treehugger.com)
They are the most energy efficient vehicles widely available and the industry is fast going in their direction due to costs coming down and their ability to meet increasingly stringent emissions regulations. (hybridcars.com)