Originally Posted by east tx skier
Run 89 in that motor as recommended in the manual and keep it stabilized (even during the season unless you are burning through a tank every two weeks). You could siphon off the gas and use it in cars or lawn equipment or you could add some 93 back to whatever is left of the 87.
2 parts 87 to 1 part 93 = 89.
Everything I've read says 87 for 351w/302 and that's all I ever ran in my 92. I guess it's just a matter of how long it sits before use and whether or not that it was stabilized.