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.