I have a stock 4xe Rubicon and am getting about 16 - 18 miles of electric only range. The range gauge shows 26 - 27 miles range when fully charged. This is a significant difference. I get about 18 miles with the top on and windows up and keeping it light on the accelerator and under 60mph, but drop to about 16 miles with the top open and windows down. What are you folks getting for range? Does Jeep expect us to drive at 30mph to get the expected range? TIA.