Re: Anyone know how many Gallons per hour on a 110hp Johnson?
A very easy calculation is to divide the hp by 10 to get a gph measurement.
In your case, 11 gph (gallons per hour) at WOT (wide open throttle)
A more complex calculation, as well as more accurate, goes on the theory that a well-maintained two-stroke outboard burns nearly 0.6 to 0.8 pounds of fuel per hour for each unit of horsepower it produces. It is important to know that gasoline weighs about 6 pounds per gallon. That being said, for your specific outboard, you multiply the 110 x 0.6 / 6 which is 11 gph. On the higher end of that spectrum 110x 0.8 / 6 is 14.7 gph.
These figures apply to carbureted and fuel-injected engines, but not to direct-injected engines such as Mercury's OptiMax and OMC's FICHT models. Also remember that newer engines with loop-charged intake systems, fuel injection and direct injection will yield higher fuel efficiency than older, cross-flow fuel systems that were manufactured as late as 1990. Cross-flow systems are antiquated and wasteful compared with the technology available today.
Fuel consumption will be decreased at cruising speeds, as these are WOT figures.
