The data is crowd sourced so it may deviate, you can contribute your data to keep it aligned. Also the quality of life and commuting comparisons can be done from the pull down menu in the header.
interesting, would imagine that could deviate quite a bit then. for things like cost of coffee / meals i could see crowd sourcing but aggregating from an online source for rentals / housing sales would lead to much more accurate estimate as they are the bigger ticket items.