I would like opinions from you boat wizards familiar with Zen and outboards.

My Nissan 3.5 drives my small Portaboat around nicely but its user
manual and the label on the fuel tank disagree. The manual tells me to
use 25:1 fuelil ratio and the label says 50:1. I've been running 25:1
because it's what I saw first. I don't notice significant smoke and
haven't had it long enough to foul the plug yet.

Any ideas on which way is best or whether this is even a subject worth
discussing? Thanks.