We had to take a spur of the moment trip in our i4 yesterday, from Philadelphia to Massachusetts (about 350 miles) due to a family emergency. Family member is now stable, so I figured I would post some of my impressions.
This car DEVOURS highway miles. It was the most unstoppable highway car I've ever driven. I set the adaptive cruise to 90 when we left and we got here quickly and quietly, with one stop in Connecticut to eat and charge. I used the integrated NAV to plan the route and charging stop and it worked as intended, guiding me to a 350 kw EA station in a strip mall with a bunch of food options, right off the highway. Charging was quick and we returned to the car with seven minutes to go in the grace period. I was admittedly not driving to maximize range, but we never felt any anxiety about getting where we needed to go safely and on time.
If this trip is an indication, I cannot wait to explore the limits of this i4, as it learns my driving style and as I learn to maximize what it can do.