Absolutely possible, I just looked in MFM my last 8 trips 5 for 100% brake score and 3 were 99%. :D
By the way, miles per kwh will vary depending on alot of factors, temp, speed, brake score, climate use, etc, etc.
In best conditions in the spring/fall, I can get 6.3 miles per kwh max with no climate control going and speeds of less than 45mph.
That is being the King of the Mountain but at 6.3 miles per kWh but he also mentions it is during ideal conditions. The information provided on the site is very helpful but don't go nuts over your personal "results". There is more to life than posting higher and higher MPG or similar figures.