
The Cessna 172 is a four-seat, single-engine piston aircraft that has played a significant role in aviation history. It was first flown in 1955 and has remained popular for nearly seven decades. The Cessna 172 has two fuel tanks, with a total fuel capacity of 56 gallons (though only 53 gallons is usable). This article will explore the topic of how much fuel a Cessna 172R holds, including any modifications that may impact its fuel capacity.
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What You'll Learn

The Cessna 172R's fuel capacity
The Cessna 172 is a four-seat, single-engine piston aircraft that has played a significant role in aviation history. It was first flown in 1955 and has remained popular for nearly seven decades. The Cessna 172R, introduced in 1996, is powered by a Lycoming IO-360-L2A engine, which produces a maximum of 160 horsepower at just 2,400 rpm.
The Cessna 172R has a maximum takeoff weight of 2,450 lbs (1,111 kg). The aircraft has two fuel tanks, with one tank mounted in each wing. Each tank can hold 28 gallons of fuel, resulting in a total fuel capacity of 56 gallons. However, only 53 gallons of this fuel is usable, as the remaining fuel at the bottom of the tanks is considered contaminated and is therefore unusable. This is due to the positioning of the fuel supply lines, which are slightly above the bottom of the tanks to avoid drawing on contaminated fuel.
The Cessna 172R's fuel system is designed to prevent fuel contamination and ensure the aircraft's endurance and reliability. The high-wing design of the Cessna 172R also contributes to its fuel system, allowing gravity to pressurize the system and reduce the need for additional pumps.
The fuel capacity and endurance of the Cessna 172R have contributed to its popularity and success. With its fuel capacity, the Cessna 172R can undertake long-distance flights while carrying passengers and baggage. However, pilots must carefully consider the distribution of weight to ensure the aircraft remains within its specified "weight envelope" for safe handling.
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The aircraft's endurance record
The Cessna 172 is a popular aircraft known for its robust and reliable performance. While the exact fuel capacity may vary depending on the specific model and modifications, we will focus on the Cessna 172R's endurance record.
The Cessna 172R, introduced in 1996, is a powerful aircraft with a maximum takeoff weight of 2,450 lbs (1,111 kg). It is equipped with a Lycoming IO-360-L2A engine, delivering up to 160 horsepower (120 kW). This model introduced significant improvements, including enhanced interior comfort and technology.
Now, let's delve into the Cessna 172R's endurance capabilities. According to sources, the Cessna 172 series, including the 172R, is known for its impressive endurance. While the exact endurance record for the 172R specifically may not be readily available, we can estimate and make informed assumptions based on fuel capacity and consumption rates.
The Cessna 172R's fuel capacity is not explicitly stated, but it is likely similar to or slightly higher than the standard Skyhawk's capacity of 53 US gallons (200 L). Some sources mention that the 172R's fuel capacity can be further increased through modifications, such as additional fuel tanks in the wing tips or baggage compartments. These modifications would undoubtedly contribute to extended endurance.
Estimating the endurance record involves considering the aircraft's fuel consumption rate. According to pilots and training forums, the Cessna 172 series typically consumes around 8 gallons of fuel per hour. However, it's important to note that this rate can be influenced by various factors, including gross weight, altitude, and wind conditions.
By combining the estimated fuel capacity with the average fuel consumption rate, we can approximate the Cessna 172R's endurance. With a full fuel tank and average consumption rate, the aircraft could potentially maintain flight for approximately 6 to 7 hours. This estimation assumes no significant headwinds or unusual fuel burn rates.
While these calculations provide a rough idea, it's important to recognize that real-world conditions and aircraft configurations can significantly impact endurance. The Cessna 172R's endurance record may vary depending on factors such as aircraft loading, flight path, and individual aircraft variations. Nevertheless, the Cessna 172 series, including the 172R, has likely achieved notable endurance feats, solidifying its reputation as a reliable and enduring aircraft.
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Fuel system and weight distribution
The Cessna 172 is a single-engine piston aircraft with a high fixed wing. It has two fuel tanks, one mounted in each wing. Each tank holds 28 gallons, for a total fuel capacity of 56 gallons, though only around 53 gallons is usable. This is due to the potential for fuel contamination—the lines that draw fuel to the engine are slightly above the bottom of the tanks to avoid picking up contaminants, making the fuel below it unusable.
The Cessna 172's fuel system uses gravity to help pressurize the system, which means it only needs an electric boost pump in addition to the engine-driven fuel pump. The engine-driven fuel pump is powered by the engine's accessory case, so it cannot provide fuel pressure if the engine is not running. The electric fuel pump serves as a backup in case the engine-driven pump fails, providing enough fuel pressure to maintain normal power output. The fuel injector servo regulator ensures the correct air-to-fuel ratio by comparing the inlet air pressure to the fuel inlet pressure, allowing the plane to determine metered fuel pressure.
The weight of the Cessna 172, including fuel, passengers, and baggage, must not exceed its certified maximum gross weight. This is typically not an issue as most general aviation aircraft cannot fill all seats and the fuel tanks without exceeding this weight. The distribution of weight is also crucial, as it can affect the aircraft's handling. If the weight is distributed outside the specified "weight envelope", it can cause handling issues at low airspeeds. Therefore, pilots must carefully plan each flight to ensure the aircraft's weight and balance are within the acceptable range.
The Cessna 172 has undergone various modifications and improvements over the years, including increased fuel tank capacity in the wingtips and additional baggage compartment tanks. The 1969 model offered optional long-range 52-US-gallon (197-litre) wing fuel tanks. The Skyhawk R, introduced in 1996, was the first Cessna 172 to feature a factory-fitted fuel-injected engine, with a maximum of 160 horsepower. The Cessna 172S, introduced in 1998, increased the maximum engine rpm, resulting in a 20-horsepower increase and a higher maximum takeoff weight.
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$26.33

Modifications to the fuel capacity
The Cessna 172 is a four-seat, single-engine, high-wing, fixed-wing aircraft. It was first flown in 1955 and has had a long and successful history, with over 44,000 units built as of 2015. The Cessna 172 has undergone several modifications since its introduction, including updates to the fuel capacity.
The Cessna 172R, introduced in 1996, has two fuel tanks, with each tank mounted in each wing. Each tank can hold 28 gallons of fuel, for a total fuel capacity of 56 gallons. However, only 26.5 gallons in each tank, or 53 gallons total, is usable. This is because the lines that draw fuel to the engine are slightly above the bottom of the tanks, preventing the pickup of contaminants that may have settled at the bottom.
In 1980, Cessna introduced a retractable landing gear version of the 172, known as the 172RG or Cutlass RG. This version had a greater fuel capacity than the standard Skyhawk, with a total of 62 gallons of fuel compared to the standard 53 gallons. This increased fuel capacity gave the 172RG greater range and endurance.
The Cessna 172S, introduced in 1998, featured a Lycoming IO-360-L2A engine with 180 hp. This model had a similar fuel capacity to the previous versions, with each tank holding 28 gallons for a total of 56 gallons. However, only 53 gallons were usable due to the same reasons as the previous models.
Over the years, Cessna has also offered optional fuel capacity upgrades for the Cessna 172. For the 1982 model, a 62-gallon wet wing and air conditioning were available as optional features. These modifications further increased the range and endurance of the aircraft.
In summary, the Cessna 172R has a fuel capacity of 56 gallons, with 53 gallons being usable. Modifications to the fuel capacity have been made with the introduction of the 172RG and the offer of optional fuel capacity upgrades, providing greater range and endurance for the aircraft.
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The history of the Cessna 172R
The Cessna 172 is an American four-seat, single-engine, high-wing, fixed-wing aircraft made by the Cessna Aircraft Company. It is one of the most iconic and widely produced aircraft in aviation history, known for its versatility, ease of handling, and durability. The Cessna 172 was first introduced in 1956 as an evolution of the 1948 Cessna 170, a tailwheel aircraft. The 172 was designed with a tricycle landing gear, making it more user-friendly, especially for novice pilots, and it quickly became popular in general aviation. The first model had a simple design, with a straight tail and a six-cylinder Continental O-300 engine, producing around 145 horsepower.
In 1958, the world flight endurance record was set in a Cessna 172 Skyhawk. Pilots John Cook and Robert Tim remained airborne for 64 days, 22 hours, 19 minutes, and 5 seconds, raising funds for the Damon Runyon Cancer Fund.
Over the years, Cessna continued to refine the 172 design, introducing new models with improved features and capabilities. In 1960, the 172A was released, featuring a swept-back tail that gave the aircraft a more modern look and slightly improved aerodynamics. This was followed by the 172B in 1961, which introduced a shorter nose and streamlined cowling, and the 172C in 1962, which added optional amenities like an autopilot and adjustable seats for improved comfort.
In 1980, Cessna introduced a retractable landing gear version of the 172, designated as the 172RG and marketed as the Cutlass RG. This model featured a more powerful engine, increased fuel capacity, and improved cruise speed.
After a decade-long hiatus, Cessna resumed production of the 172 in 1996 with the Cessna 172R model, which was the first factory-made fuel-injected 172. This model introduced improvements such as a new interior with soundproofing, an advanced ventilation system, and enhanced safety features. The 172R was followed by the 172S in 1998, which offered increased horsepower and improved takeoff weight.
Today, the Cessna 172 remains a favourite among flight schools, private pilots, and commercial users. With over 44,000 units produced, it is the most produced aircraft in history. Newer models continue to be in high demand due to their affordability, simplicity, and ease of handling.
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Frequently asked questions
The Cessna 172R has a maximum fuel capacity of 56 gallons, although only 53 gallons of fuel is usable. This is because the lines that draw fuel to the engine are slightly above the bottom of the tank, preventing fuel contamination.
The maximum takeoff weight of the Cessna 172R is 2,450 lb (1,111 kg).
The Cessna 172 series is known for its endurance and popularity. Over 44,000 Cessna 172 aircraft have been produced, and more than 50% of the world's pilots started their training in the Cessna 172.










































