Is 220 mph enough for wet leaves?

220 mph is high for a gas backpack blower and moves dry leaves and light debris easily. Wet, matted leaves still need you to work close and may take repeat passes, since air volume matters as much as speed.

How heavy is it to wear?

It weighs 17.5 lb. The backpack frame spreads that across your shoulders and back, which is easier than holding a blower for an hour, but lifting it on and off is a two-hand job for some users.

What fuel does the 37.7 cc engine use?

It is a gasoline two-stroke-style small engine, so expect to mix fuel with two-stroke oil at the ratio in the manual. Check the manual before the first tank.

Does it come with a blower tube and harness?

The listing does not detail the box contents. Confirm with the seller that the blower tube and shoulder straps are included before you buy.

Backpack or hand-held for a half-acre yard?

For a half acre with trees, a backpack blower like this saves arm fatigue over a hand-held unit. For a small patio or a few beds, a lighter hand-held or cordless blower is less trouble.