my fusion is 88000 miles 2013, it claims about 16-17Miles, on the freeway at 60mph it does about 13. the battery constantly reads 3.8kwh for the discharge. the battery packs are made of 3.7volt cells all stacked together. they have temp sensors and they also do load balanced charging. I am thinking that ford is bad with their qc on each cell. and I bet these cells are dying, while others remain and operate fine. the pattern I am seeing is people quickly loose there capacity but eventually stabilize. there is a company in taxes that takes Prius battery's apart, they check each cell, and take all the good ones and load balance them and make a refurbished battery pack.. the bad cells are dead. I hope in the future they will service the fusion, or there will be cell upgrade options.