Drive in Aveo 1.2: What speed and how much gas?

Day! Get my new Aveo 1.2 with LPG with 0.0km next week at the beginning/middle. I commute 30km daily to work and at the WE there is a ride Stuttgart-Munich, with corresponding climb on the A8. LPG I want to drive from the 1st second to expect it. And now my question: I don’t want to drive the first 3000km more than 120km/h / 4000U/min, is that exaggerated? And with 5km motorway ascent 12%, prefer to sneak in the 3rd or 4th with the trucks? thank you & greetings