Since the Yanmar fuel usage was brought up thought Id post this.
I checked my tank with my stick before working it 3 hours last weekend moving super heavy 30" green Oak rounds and a few 1200# logs out of a shelter belt out to a trailer on the road 100 feet or so away for a friend.
I started out with 1/2 tank and when I unloaded it at the shop it had 3/8. So I used 1/8 tank for 3 hours of solid running shuttling back and forth not hard pulling but higher rpm's and some idling.
So by my estimate I used aprox 1 gallon the tank holds about 8-8.5 total thats pretty impressive and inexpensive machine operating expense imo. fwtw