No additional drag on a 120 over a 104 as both are 8"
dia., unless of course you swim sideways ;-).  The 120
might be 5 # heavier so that is not an issue for a
single tank, which was being asked about.  However
they are considerably longer which some folks find
cumbersome.

Dave

--- Bob Sherwood <sherwood@st*.rr*.co*> wrote:
> 
> >The other reason to prefer a smaller tank is that
> it takes force to 
> >push a big tank through the water, so it's a
> diminished return.  You 
> >have more gas, but you need more gas to push the
> tank around.
> 
> 
> my scooter cant tell the difference between 95's and
> 120's <G>
> 
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