As a teen we water-skied a lot behind an old Johnson 25 hp.
Our standard mix was 1 qt SAE 30 non detergent per 5 gal of gas.
No 2 stroke oil as it cost more plus we got discount by the case.
We burned 3-4 tanks per day every weekend plus a couple during the week days.
Did that for some 5-6 years.
Must add that that motor jumped off the transom more than a few times.
(std ops was drain the carb, blow dry the plugs and continue on)
B4 selling that old jonrude I tore it down thinking it must need rings ore something but to my total amazement it was just like new.
Wonder if today's motors would stand up to that sort of use/abuse?