I got almost 20 gals of gas out of the tank of my Cruisers boat before I scrapped it a few weeks ago. It had been sitting for 3 years but was treated with Sta-Bil. My lawn equipment loves it. Not a problem with the mower, tractor, and 2 string trimmers. (oh, and 5 gals went into my car and no problems there either). As long as the gas is clear and there's no sediment it will mix with fresh gas and burn fine. I would not use it in your outboard though... they tend to be a little more picky on the gas they drink.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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