Horsepower hours per gallon is a measure of an engine's fuel efficency at a given horsepower output. For any engine the number will vary depending on the throttle setting, horsepower output. It is calculated by operating the engine at a constant horsepower for a given period of time and measuring the fuel used. The horsepower setting is multiplied by the operating time in hours and divided by the fuel used in gallons, hence the term horsepower hours per gallon.
For example; consider a 100 horsepower tractor operated at 60 horsepower for two hours. The fuel consumed was 12 gallons. We have 60 x 2 divided by 12 = 10 horsepower hours per gallon @ 60 horsepower. Note, the fuel consumption was measured at 60 horsepower, therefore that number needs to be stated.
To determine the gallons of fuel used per hour we just divide the horsepower setting by the horsepower hours per gallon. In our example; we have 60 divided by 10 = 6 gallons per hour when operated at 60 horsepower constant output.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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