Brushwacker said:My 026 does good with 3/8 and a 20" bar in average wood to about 14" in diameter. Had an Husky 55 that pooped out trying the same combo,then tried 16" bar 3/8 and did ok. I"ve used .325 7 tooth on some saws and sometimes it increased fuel consumption to the point I was spending to much time adding fuel. I would guess most saws that come stock that way are probably efficient with that combo.
Try 3/8 with a cheap bar chain combo and compare. Can sell it on ebay if it doesn't work good.
I would think either of those saws would be much faster with .325 and I hav'nt the slightest logical idea of why you think fuel consumption would go up when using it. .325 is generally narrower which means you're removing less wood. What's not to like unless your saw has the power to stretch it? I can't even imagine running a 260 with 20" of 3/8ths but that's just me. My 20" bar is powered by a 036 running 050 .325 Woodsman Pro and 8T rim. It zips.
John.....