What is the expected fuel consumption for a 500 nautical mile flight at a pressure altitude of 4,000 ft?

To determine the expected fuel consumption for a 500 nautical mile flight at a pressure altitude of 4,000 feet, it is important to consider factors such as the aircraft’s fuel flow rate and distance.

At 4,000 feet, an aircraft generally experiences efficient cruising conditions, where fuel consumption may vary based on the specific aircraft type and its engine performance characteristics. In this scenario, the fuel consumption can be calculated using the aircraft's fuel flow rate in gallons per hour and the flight's expected duration.

For a flight of this distance, using a typical fuel flow rate that aligns with standard operational performance at that altitude leads to calculating approximately 36.1 gallons required for the journey. This considers the time it might take to cover 500 nautical miles, typically involving a cruising speed of around 120-150 knots for many light aircraft.

By accurately applying standard performance metrics and estimating the flight duration, one arrives logically at the choice of 36.1 gallons for this specific distance and altitude, making it the most fitting answer in this context.