Prime 2017 max speed?

IIRC, that is about right, driven at least in part by MG1's rpm limit. Similar for my RAV4 Prime. To go faster, the ICE must be fired up, or at least spun up.

Non-Primes, at least of older generations, had lower ICE-off speed limit thresholds, above which the ICE must spin to protect MG1 from overspeed.

 

The 2017 Prime has a lower top speed than the normal 2017. This is due to the lower gear ratio that the prime has.

 

It is fast enough for me. I once took a trip from Seattle to Denver going South thru Oregon and Idaho. The speed limit was usually 80 on the freeways. Set the cruise control to 90 and just cruised. I typically set my CC to ten over the speed limit. It has been quite a few years since I have received a ticket.
Ray

 

I do the same, but in km/h, 15 km/h over (almost 10 mph). No tickets either. The only exception are the photo radar. They trigger at 10 km/h over (6 mph) so gotta be careful there, especially with the mobile photo radar.