Sure, as long as you’re driving a car designed to run on the autobahn.
I’ve cruise controlled 400 mile trips in CA set on 100 in a Saturn SL2 before they started radaring the interstate here. Most fly over country freeways are in better shape than here too...
I had my ‘89 Ford Ranger SLT on the autobahn many a time. Of course, the speedometer on the Ranger only went up to 85, but I have gone faster. How fast? I’ll never know. I’ve actually been cruising at top end (85 MPH) and then gone faster. Once a 911 came blazing by, so I pulled out and chased it! LOL! It got away, of course, but I did feel my truck actually accelerate. I was going down hill at the time. This was somewhere on A-61 north of Speyer.