Thank you for your reply!

One of the two aims of the cruise log you are seeing was to find out the real-world top speed of the car, so we pushed her hard on an empty stretch of Autobahn. In "normal" cruise I seldomly go faster than 90.

Regarding the TPS value - I somehow managed to change the display between screenshots, sorry. And I don't have a knock sensor installed - the Cleveland engine starts to run rough and lose power some time before misfiring, so I am pretty sure my ignition timing (based on an article in Hot Rod magazine and the stock dizzy curving) is not harming the engine...