Depending on a) your driving style and speed, b) the weather, and c) your use of heating/cooling features you should see real range numbers from 180-240miles for a full charge.I've only had our vehicle for a few weeks but the range listed at fuill chagre is only 218 MIles. The higheest we ever saw was 223 one time. I honestly feel like the 218 is the car being optimistic.
I do drive pretty conservatively in Comfort mode as the grandkids are usually aboard. The range prediction is based on a number of factors including your driving habits, use of climate control, ambient temperature, city/highway driving. I don't think you're doing anything wrong and 218 miles isn't bad at all. After a software update my GoM showed 201 miles for a few weeks until the car readjusted to my driving. You might consider downloading WattCat which will tell you the battery kWh. Depending on your ambient temperature the battery should be over 80 kWh at 100% SoC. During the Colorado winter WattCat showed 78-79 kWh but with spring I am seeing 84.I'm stil only seeing 218 Miles. Are you guys with the high miles driving more intentionally than I am? I must be doing something wrong.