dasintex-
The smaller engines do like more oil, and current thinking says it doesn't hurt anything to run extra in the bigger ones as long as you're using decent oil.
I think you'd be OK at 40:1 after break in. A lot of us though (myself included) are going for easiest way out and going with a single gas can, running whatever mix your smallest engine demands. This leaves me running 20:1 in everything. Have been doing that for a couple of seasons now with no known issues other than having to clean them more often. That's a negligible price to pay for the simplicity one gas can provides in my mind, so that's my vote. -Al