If OP has their cruise control set at 72MPH and is tailgating close enough that they benefit from the slipstream, I'm 1.)impressed at their precision driving 2.) terrified we may share the road some day.

I don't doubt that we may someday achieve more autonomous highway cruising where vehicles take 'lead' and 'follow' positions within feet of each other to benefit from drafting, but humans doing it scares me senseless.