I pick up the 2016 Smart electric car (base model) from the dealer tomorrow. It is about 80 miles from the dealer to my house. The car when charged 100% shows a range of 63 miles. I am planning my route The first part of the trip is on interstate highway. The terrain is flat, temperature in the 70s with no rain and if I do the minimum speed required (55 mph) what kind of range can I expect before I head to find a charging station? Thanks.