Most decent engines without powertrain losses will do about 10-16 HP per gallon per hour. This diesel is rated at 180 grams per hour per HP. My Insight would go 40 MPH on .5GPH. 1 horsepower per hour on .5 gallon of fuel sounds very low. A V8 burns .5 GPH idling same as my Insight did going 40 MPH. I guarantee you the Insight did not got 40 MPH on one horsepower.
regards
Mech
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