Our 2014 Energi Titanium. I did a trip to of 115 miles one way on 40% 4 lane 60% two lane. I started w/ full electric charge. Running 68 mph on the 4 lane and 60 mph on the 2 lane w/ a fair amount of hills I averaged 61.2 mpg for the trip. Another trip for 130 miles one way on interstate running 74 mph with hills we averaged 44 mpg. So if your commute is flat or fairly flat ground and you are truelly only running 55 to 65 mph then I would expect to see something very close to 60 mpg for your commute each day. Our total average for 3500 miles is setting at 55.6 mpg. The distance driven each day is approx 60 miles and we can only charge one time at home. Having said all that, what will be the cost to upgrade to the Energi that you want. Will the extra 25 to 30 mpg savings ever overcome the cost of the new car?