Hi guy's I had a 16 ft invader running two 70 yamaha on the back ,from RBS to rooi walle and then to the big ships and trolling around there for a while and then back to RBS I never had to swop to the next cans of feul but they were preety close to empty by then ,I sold the invader and I am now bying a kingcat 180 secondhand boat with two 85 premix yammies on the back 2004 models in verrey good condition +- 150 hours ,ok what I would like to know running the same crew and lets say the same distance how much more feul will I use some guys say 5 liters per motor, some say 20% , ather guys say those things are thirsty hey I dont mind them being heavier on feul it is obvious they would be, but am I going to use 20 liters more ??