My Audi only turns up to approx. 5600 rpm in 5th gear, that’s 200Km/h according to the speedometer. Otherwise I could always turn the 5th up to 6400U/min. According to the speedometer 225 – 230Km/h. What’s going on??? Have no noticeable power loss. And in the other gears I can turn it to the red area. Can this be due to the new summer tires? Have Toyo Proxxes T1 on it in 205/50 R15. Higher rolling resistance or something? However, my fuel consumption has not changed.