The Crew Demo back when I played it, I turned off VSync (even IIRC, though it still locks + was hard-coded to 60FPS period). I was running around 40-50 frames at max-settings for 1080p on my PC (i7 950; 4GB 960; 16GB RAM DDR3; Win 7 64-Bit). I'd guess + hope the final version runs the same way or runs better by now - sounds like your doing fine w/ your PC, so that's a good sign.
I usually often turn off VSync. You can often gain lots of frames by doing so. I usually only turn VSync back on if weird stuff happens graphically - such as graphical tearing; things not being displayed correctly; and any other graphical weirdness/oddness. A lot of the newer games these days don't run into weird graphical stuff w/ VSync Off, thankfully.
Back when I tried The Crew demo, the game was very good technically. One of the better-looking + running newer games I've seen and ran around max or close to it on my rig.

We can all complain often about how poor UbiSoft ports on PC are performance-wise - but often, games like WD, ACU, FC3+4 look amazing on PC; especially when thrown up to higher settings. The problem is - can you handle your rig handle them? And results can vary - God knows w/ Ubi PC ports.
I probably shouldn't have hesitated to buy either version (The Crew: Wild Run Ed or Complete) yesterday b/c I was unsure if I should skip the Season Pass or not - but then even Wild Run Ed got pulled. Meh. All versions of The Crew are full price now on Amazon. Oh, well - have to wait until next sale, glitch or whatever, I guess.