I have run both a 4 stroke Yamaha 225, and an E-tec 225. For the most part the fuel economy is pretty much the same. Both are very efficient trolling, and both suck copious amounts of fuel wide open. If you have a carbureted engine now, then either a 2 or 4 stroke fuel injected motor will be more efficient that what you have now though. I just think that too many people think that 4 strokes are great on gas, but at least in my case that isn’t true. They are better than a carbureted 2 stroke engine, but compared to a direct injection 2 stoke it is pretty much the same.
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I’ve got a 90HP 2-stroke and love it! Would like to upgrade to a 4-stroke at some point to gain some fuel economy but, money talks and the old ball and chain seems to think otherwise ! I’m not one for speed but with 3 guys and gear I’ll top out at 40 mph…