Hey there, I have a spanking brand new ECHO leaf blower (PB-251) that I got yesterday for Father's Day and had a question about octane. I mixed up a one-gallon batch of 2 cycle fuel mix using 87 octane and in my excitement forgot that the manual calls for 89 until just now. I topped off the blower with the 87 mix yesterday and all seemed fine when I ran it. I am concerned however that I might do damage to the engine running the 87 mix (detonation, pinging, etc). I think my options are: 1. Dump all the 87 mix in and start over with 89? (This is a pain because I have to dispose the 87 mix and waste money.) 2. Use some Lucas Octane Booster that I have to bring the fuel up to 89. Is this even safe to do to a leaf blower? 3. Run it in my lawn mower. 4. Run it in my Volvo turbo wagon. :) 5. Run the blower with the 87 and don't worry about it. What should I do? Thanks!