have a '90 yamaha 200 on my Tournament 225. I have an inline filter/water separator which I change out every spring. I probably carried 40 gal. of 10% ethanol blended gas over the winter. Was lucky last year: I topped off tank with high test and had no problem. Should I also consider adding drygas to last fall's fuel to absorb excess water? I use that stuff on all my small engines in minute quantities and never had a problem, but I don't want to fry an outboard. What should I do?