. The study looked at vehicles in the used market and the manufacturer’s listed mpg for various models.The rest of the top 10 for fuel use are No. 2 Hawaii at 28.4 mpg, then Washington state at 28.2, Oregon at 27.9, Nevada at 27.5, Arizona and Colorado at 27.2, Virginia and Maryland at 27.1, and Utah at 26.8.
Note that the high mpg states average 27.9 miles per gallon vs. 23.5 in low-efficiency states. That’s a noteworthy 18% difference.Gas averaged $4.16 per gallon in high mpg states in mid-July, using AAA fuel data. California ranked No. 2 at $4.88. So let’s imagine the fuel cost of a 250-mile drive, assuming a state’s miles-per-gallon efficiency and its gas costs.