Yes, I wouldn't worry about it too much - just try to be conservative on the accelerator. If you're braking a lot, then you're going too fast :-)
I am only on my second tank, currently, so nowhere near what bluecar1 does, and my current MPG for the tank is about 55mpg, hindered by the weather, short journeys (school runs mainly), etc. so I am expecting it to improve as I get used to the car.
My Gen2 Prius used to only average 52-53mpg, so the Ioniq already does better than what my Prius ever achieved.
2017 Hyundai Ioniq Premium
Previously: 2004 Prius T4