You own a Cessna 172N. The original engine installed on the airplane is a 160 horsepower engine. You have purchased an STC for the installation of a 180 horsepower engine. As part of the installation, your mechanic wants to verify that the fuel flow provided by your airframe is adequate for the higher power engine. In a timed fuel flow test, what is the minimum amount of fuel that must be able to be delivered to the engine. The Cessna 172N has a gravity flow system. Group of answer choices 22.5 gallons per hour 180 gallons per hour 11.25 gallons per hour 15 gallons per hour