ok i have proved this for myself, if you take oil out of the gas you will run rich on fuel in combustion chamber and will need to rejet and adjust all circuits in the carb, (heres what happened to me) i was always running my sled with the oil pump set to the rich side, (the thickness of the line over) well last season i decided to set the oil pump to factory spec,(they always rich on the safe side).well it was runing ok earlier that day, did the adjustment to the oil and kept runing, then noticed if i was leading and could set the pace it was ok but if i had to follow it was hell,just seemed slugish unless i was in the higher rpms. started just doing plug checks again and dam, i went from wet brown to wet black brown, we were runing a loop so as soon as i got back, i pulled the rack and rejetted leaner moved needles leaner and damn right back to what it was before actually alittle better response wise and mileage and have been runing that way ever since, and its been two seasons now. now for the ratio part (opsled) i sure your assuming wrong the on ratio, the pump is variable based on rpm (pump speed) and throttle pos. (valve pos) the whole idea behind the pump is to feed oil to match demand, the old pre mix way you set the ratio and it was the same through out the range so your lower rpms are being drown with oil you only need oil below the combustion chamber, anything that goes into the combustion chamber is robbing performance(loading up fouling plugs). now with the pump you get lets say 100:1 at idle and 50:1 at wot and other ratios in between and an increase in perfomance. now the carb also meters the amount (in a sense)at idle the fuel mixture is being pulled through smaller openings, at wot its being pulled through bigger openings so the amount of mixture fed to the motor changes, its not like a sled is a miser on fuel so as soon as you go from idle to wot all you have to refill with the increased ratio is the bowl and lines from the fuel pump but it never goes without oil. if you go with the direct inject into the bottom the amount of oil needed is less. and fuel jetting is less. go to a boat show and see if there is an ETEC running(some places they can ) there. that motor is direct inject oil and fuel and with there oil can be set to run at 100:1 wot.( just an example) opsled if your belief was correct you would load up at low rpms from excess oil at a constant 50:1. im not slaming you just opening debate.