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kwkfsh

Cruizin' with my Yammy...

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With a planing hull you will find that almost all gas engines get the best fuel economy at somewhere between 3500-4000 rpms. also the harder you run it the shorter the the lifespan ( more heat, more vibration, more wear, etc.). You should be able to feel where it likes to run and seems to just be loafing along, this is likely where you are going to get the best fuel economy also. grin.gif

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My motor tops out at about 5800 rpms. It's a 4-stroke 115 Yammy. I've always followed the conventional wisdom of not approaching the top rpm's when I'm running from spot to spot. Typically, I'll run at about 4600 to 4800- it's plenty fast and I assumed used less fuel.
However, I've heard recently that this isn't necessarily true. Is it true that 4-strokes will get better fuel efficiency and be easier on the motor when they're run at higher rpms (like 5300 to 5500)? For the life and health of my motor, what's the ideal rpms to run it at? For fuel efficiency, what's the ideal rpms to run it at? If these aren't the same, what's the ideal compromise to run it at?
Scoot

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