I'm not sure about this one ,but the older ones similar to this one , you had to mix the oil manually ...I'm not sure how easy it is the drain all the fuel from this model if you wanted to use the fuel tank for gasoline only ...
With the CRAP ethanol that we are using here in the N.E. , your fuel doesn't last as long ... I would want to syphon the fuel and use it in my car at the end of the boating season if there was much left in there ....I did that with my last boat and got a couple of full tanks for my car, not to mention a nicely drained tank ready for fresh fuel when the season starts back up again ... Oil already mixed in the fuel prevents you from doing just that , and the fuel would be bad for sure by Spring of the following year ....Just my take on it ...They are also modified V's which ride a bit harder in the chop ....Good on a drift , but tough going in a tight chop ...Again , just my guess ....YMMV ....Jim