How much do gasoline and diesel engines consume?
Diesel engines consume about 1 gallon per hour for every 18 hp used. You can estimate the number of gallons consumed per hour by multiplying horsepower used by 0.055.maximum available horsepower. Most marine engines are designed to run continuously at between 60 and 75 percent of maximum speed. Diesels tend to be more toward the top of the range. Gasoline four stroke inboard engines need about 1 gallon per hour for every 10 hp used. The number of gallons consumed per hour can be estimated by multiplying horsepower used by 0.100. (see note above) Outboards might use considerably more since two stroke motors seem to have a greater thirst than four stroke motors with exception of the Evinrude ETEC. What about fuel economy? Any attempt to force a displacement hull beyond its maximum theoretical hull speed brings exponentially higher fuel consumption for minimal gain in speed. On the other hand, slowing down a little almost always is rewarded by gains in economy, and thus range. This same p
