I agree that 74.7" is more likely to be the true width. BUT (there's always a but...)
this would mean that the
official H3-flyer is WRONG, when it says that the car is 85.5" inches wide EXCLUDING MIRRORS (and I have to say that I NEVER saw a printed flyer, which had wrong information in it, while I saw a lot of info on the internet, which was wrong).
Also please note that due to the wide fenders of the H3, the mirrors almost don't make any difference to the H3's overall width. Just look at the pic below.
I guess we wont find out, before it really hits the market. But it's a little surprising that so many people have already placed their order, when not even the dimensions of the car have been clearly communicated yet.
Edit: Maybe it's 74.7" in the middle (i.e. w/o the mirrors or the fenders), but 85.5" with the fenders (i.e. at the front)? Because you can clearly see that the car is more narrow in the middle, than it is at the front and at the rear end).