Mine weighs 680 lbs with 8.50 tires. And fwiw, I have seen lighter ones than mine.

There was a Super STOL built that was in the low 600's, even had nitous with a 115 hp 912. But he admittedly went crazy on weight reduction as he built it to win Valdez (unfortunately it was damaged by a truck running into it while it was shown at the Alskan Airmen Convention a day before the contest, so it never saw the competition).

I agree that many will weigh more, but they can be built light if that's what a guy really wants. If I recall correct, Steve Henry's latest highly modded Highlander is around 700 lbs.