This is strange, although I would say that you might have to wait for the data to update in the driving analysis. My drive today gives me a very large miles per kWh in the app driving analysis, but I can tell it's not updated yet since the total miles isn't correct. You also need more miles driven to get a good idea. I drove about 1+ hours so that's better data, getting 3.6 miles/kWh for 81.9 miles today.
After looking at your info again, it seems like you drive a lot of short distance not in the highway?
After looking at your info again, it seems like you drive a lot of short distance not in the highway?