real consumption at high speeds

Hello to all Prius drivers! I would like to ask you a question. I understand that the hybrid drive in the city has great advantages. But what is on the highway? If you drive at a constant speed, you can never charge the batteries, but still carry the whole weight of the batteries. So let’s answer 3 questions, which I would like to answer honestly and unbeautifully. 1. What does a Prius consume when you ride on the highway in normal car traffic without being an obstacle, al 150 km/h 2. What does a Prius consume if you set the cruise control constant at the electronically limited top speed (170 or 180 km/h) 3. Is it possible to remove the electronic limitation of the top speed according to the software? Thank you, AudiV6