jadnashuanh wrote:. . . The i3 REx, with its small gas tank paired with a small ICE, and serial hybrid configuration, is not well suited for longer range. . . .
I would equate cross country in a BMW i3-REx to cross country on a motorcycle. Faster than 70 mph soon defeats the trip much like the slip stream can beat up the rider. Stopping every 70 miles, ~1:15, means frequent, short breaks. At 38-40 MPG, it is in motorcycle performance but with four seats and luggage. Carry a spare can of gas, 1-2 gallons (2 gallons using a Briggs and Stratton gas can.)