I have a LG washing machine and LG dryer that are wifi connected. I keep 90 days of netflow data. Both have used about 10mb total over the last 90 days, 100% on port 8883 tcp back to AWS EC2 owned IP addresses. Typically less than 100kb/day with a high of 2mb/day and a low of 12kb/day.

Looking at the calendar, this corresponds to days we ran loads vs idle no use days. I'm okay with this level of data usage.