It's ok to mix a big batch. Once mixed the fuel/oil mixture will not seperate, even while stored. Follow the proper ratio for your engine. As a precaution, be sure to use Stabil in your fuel, especially if you plan to store your boat for any lenght of time. Personally, I always put it in, it's a small price to pay for the peace of mind. 
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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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