"peter" wrote in message
news:1Fe8j.3750$W27.1360@trndny09...
I have a gas leaf blower that requires 40:1 oil:gas mixture. I have a 1
gallon gas tank premixed with this oil gas.

I'm thinking of buying a chainsaw (stihl) which requires 50:1 mixture. Do
I need another gas tank to premix with this ratio, or is it ok to just use
the 40:1 mix? Or perhaps I could put 45:1 mix in both??

BTW, all 2-cycle engine oil claim to be smoke-less. Which is the most
smokeless of all?

First, check the instructions again. Some are different depending on the
oil. IIRC, Stihl is 50:1 on their oil (probably synthetic) but needs more
oil for the regular stuff. In your case, I'd use 40:1 for everything unless
it makes an exception for better oils.