US cable internet customers now use 268.7GB per month on average. That’s up from 226.4GB at the end of June 2018 and a 33.3 percent increase over the 2017 year average. The number of power users—households that use 1TB of data or more each month—also saw a significant increase, more than doubling from 2.11 percent in 2017 to 4.12 percent in 2018.