What is open loop-drive and is it normal?

My scanner did say OL and drive but they were separated by something. The scanner doesn’t really seem to give real-time data for some of the info and I hate to fiddle it much while driving.
I would guess that even though I’m not at WOT the demand is considered as much with the low manifold vacuum vs rpm. It takes a lot of HP to push these bricks at 70 mph. Not one single thing is aimed at fuel savings or aerodynamics. I don’t even have an overdrive. I could probably tow it on a trailer behind my diesel pickup and get better mileage.
Yeah what yours is doing sounds pretty much identical, sounds like you've got a bit more top end than me before it switches just due to the 4.11s and 35's and my 4.56's and 33's since the rest of the drivetrain is the same. Thanks for the input