I'd run the both on the richer mix, the 40:1.
Worst case, fouled plug and some carbon
in the muffler. If you run too lean, the risk
is engine damage, and loss of warranty.

In regards the OP, they usually aren't fussy.
I'd run the richest mix in all the machines.
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Christopher A. Young
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wrote in message ...

I agree. If you have some eqpt that calls for 40 and some
for 50, I wouldn't have two seperate mixes. I'd split the diff
and go with 45.