detansinn

You need to be in sixth gear. It won't top out if you're in 8th. Gears 7 and 8 are basically overdrive ratios for fuel economy. It's got nothing to do with break-in per se, but the engine does wake up with the miles.

...also, if you're driving in the United States, SLOW DOWN.

harshalp

Aha thank you did not know that, and yep slowed down already keeping it at or under a 100 haha hard not to be at that speed
I won't be trying to top out anytime soon but next time I do I will make sure I'm in 6th (and in a safe place to do so )

Bluehighways

When thinking about sustained speeds and tires:

1. For the ECE test, the tire is properly inflated and mounted on a wheel attached to a testing machine in a room that’s heated to 77 degrees F.
2. The tire is pressed against a metal drum with enough pressure to simulate a realistic load.
3. Starting at a speed 40 km/h lower than the proposed rating level, the tire is spun for 10-minute increments at higher and higher speeds, until it reaches the target speed.
4. The tire spins for 10 minutes at the target speed.
5. It’s then removed from the machine and inspected for any failures, like separation of tread components. If it’s intact, it passes the speed rating.

For tires having a maximum speed capability above 149 mph, a ZR may appear in the size designation... above 186 mph, a ZR must appear in the size designation, including a Y speed symbol in brackets. For our Porsche 911's, both a "ZR" and a "(Y)" Speed rating is required per ECE Standards. Even then, the test is passed at 10 minutes without a failure. Of course at 186+ mph you're covering a lot of ground in 10 minutes. At 191 mph that'd be 31.8 miles. YMMV of course . . . . LOL
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My rear Goodyear F1 tires.