Just as with official combined fuel consumption figures, the claimed maximum range and the indicated range available are intended as a guide rather than absolute fact. As you mention, there are a large number of variables that can affect energy consumption when driving, which causes the range to fall. Tyre pressures, ambient temperature, vehicle load, driving style, speed, vehicle mode, use of ancillaries and so on. In addition, because your Soul is two years old it is likely to have experience a little battery degradation, although we would expect this to be only a few percent at most.

If you are getting an indicated 240 miles and can achieve 220 miles from a single charge then this would suggest that the indicated range is quite accurate. Although your previous car always indicated the maximum range, it is not necessarily the case that this was accurate. If you are concerned about the condition of your car, we would suggest visiting a Kia dealer or independent EV specialist for a battery health check.