Tohatsu claimed they were running on that volume theory also. Their 40/50 would pump 8-9 pounds in clear water. They quickly pumped zero in mud and vegetation. My 4 stroke Merc pumps 27 pounds at 6200 rpm. It very seldom plugs in the marsh. I run factory trim and seldom have to stop and hit reverse to clear the motor. I have run both, I'll take the 27 pounds any day over the 8-9 pounds.
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