The speed cutoff on my stock manual 5 speed 4 cylinder Mazda 6 2004 was at 125mph. The CX-5 would probably be able to reach around the same speeds. It just won’t get there very fast. But I suspect the max speed on the speedos is selected more in terms of design and visual than actual speed expectations.
Remember the CX-5 is also sold in germany where autobahn don’t have speed limits. I don’t think a 140m’h speedo is crazy, but yes the car won’t make all the way there. Even if it could you would probably hit a speed limiter before that.