Here are the most and least efficient states in terms of building, auto, and transportation efficiency. 

In a recent Insulation Institute blog, Stacy Fitzgerald-Redd analyzed the results of a new report on the energy efficiency of states: 

The report from WalletHub, a personal finance company, analyzes data from various government agencies in 48 states and ranks each in their building, auto, and transportation efficiency. While some states have aggressive stretch energy code requirements, other states lag in their efforts.