Regan Brown
Fuel mileage is a critical aspect of NASCAR racing, with fuel strategy often making the difference between winning and losing. NASCAR Cup Series cars do not have fuel gauges, so teams must rely on calculations, experience, and instinct to determine fuel mileage. The fuel tank capacity of NASCAR Cup Series cars has varied over the years, with some sources stating 18 gallons, while others mention 17.75 or 22 gallons. The fuel dump cans used during pit stops typically hold 12 gallons of racing fuel, and the amount of fuel consumed during a race can vary depending on factors such as track length, speed, caution flags, and driving style.
| Characteristics | Values |
|---|---|
| Fuel tank capacity | 18 gallons |
| Fuel can capacity | 12 gallons |
| Fuel cell capacity | 17.75 gallons |
| Fuel dump can weight | 95 pounds |
| Fuel dump can capacity | 12 gallons |
| Fuel type | Sunoco Green E15 |
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Fuel mileage strategy
NASCAR Cup Series cars lack fuel gauges, making it challenging to precisely determine the amount of fuel consumed during a race. Teams rely on mathematical calculations, experience, and instinct to estimate fuel mileage. Various factors, including track length, race distance, and driving style, influence fuel consumption.
To optimise fuel mileage, teams employ several strategies. One approach involves calculating fuel mileage based on the amount of fuel dispensed during pit stops. By weighing the fuel dump cans before and after refuelling, teams can determine the precise amount of fuel consumed. This data, combined with the number of laps completed, helps crews estimate fuel mileage and make strategic decisions.
Another factor impacting fuel mileage is the racing surface. Abrasive surfaces contribute to higher tire wear, which in turn affects fuel efficiency. Additionally, driving styles play a role, as drivers who charge deeper into turns before easing off the gas pedal tend to use more fuel.
The type of fuel used in NASCAR races is also significant. The specialised Sunoco Green E15 fuel, with an ethanol content of 15%, requires dedicated fuel systems due to its increased oxygen levels. This fuel is rated at RON98, indicating its octane rating or self-ignition point. The fuel's compression characteristics further influence engine performance and fuel efficiency.
In summary, fuel mileage strategy in NASCAR involves a combination of mathematical calculations, experience-driven insights, and adaptations to track conditions, driving styles, and fuel characteristics. By optimising fuel efficiency, teams can enhance their chances of winning the race.
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Estimating fuel usage
One critical factor in estimating fuel usage is the track type and race length. Different tracks have varying lap lengths, and shorter tracks like Martinsville result in cars covering less distance than longer tracks like Daytona. Thus, fuel consumption is closely tied to the race's total mileage. Additionally, track characteristics such as speed and surface type influence fuel mileage. Smoother racing surfaces may offer better fuel mileage than abrasive surfaces, which impact tire wear and, consequently, fuel efficiency.
Driving style also plays a significant role in fuel usage. Aggressive driving techniques, such as charging deeper into a turn before easing off the gas pedal, can increase fuel consumption. Caution flag conditions, on the other hand, generally result in slower speeds and reduced fuel usage. A rule of thumb suggests that two caution flag laps are equivalent to one green flag lap in terms of fuel consumption.
The weight of fuel is another factor to consider. A gallon of racing fuel typically weighs around 6 pounds, although this weight fluctuates with temperature—warmer fuel is lighter. Teams weigh the fuel dump cans before and after refuelling during pit stops to calculate fuel consumption precisely. By subtracting the weight of the empty can from the initial weight and dividing by the weight of a gallon, they can determine the number of gallons dispensed.
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Fuel tank size
NASCAR Cup Series cars are not equipped with fuel gauges. Teams must determine fuel mileage based on math, experience, and instinct. Fuel consumption depends on the track and the speeds the cars are running. For example, a 500-lap race at Martinsville is a shorter track than the Daytona 500, meaning cars cover half the distance.
The standard fuel dump can weighs approximately 95 pounds when filled with 12 gallons of racing fuel. A gallon of racing fuel weighs about 6 pounds, though this weight varies with temperature. The weight of the fuel cans is noted before and after refueling during pit stops to get a precise measurement of fuel consumption.
NASCAR fuel cans are 12 gallons, while fuel cells were previously 17.75 gallons but shrunk to 17 or 18 gallons with the advent of the COT. Fuel cells are strictly regulated to ensure gas mileage, not capacity, determines winners and losers. Fuel tank sizes have also been known to vary, with 13-gallon fuel cells used at Charlotte in 2006 and Las Vegas in 2007.
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Fuel weight
NASCAR Cup Series cars typically use specialized fuel, such as Sunoco Green E15, which contains 15% ethanol and has an octane rating of RON98. This fuel is designed to meet the unique requirements of NASCAR engines, which are often high-performance V8 engines producing over 900 horsepower. The weight of a gallon of racing fuel can vary depending on temperature, but it is generally estimated to be around 6 pounds per gallon.
The size of the fuel tank in a NASCAR race car can vary depending on the regulations and specifications set by NASCAR. In the past, fuel cells with capacities of 22 gallons were used, but more recently, the fuel cell size has been reduced to 17.75 gallons or even 18 gallons, as mentioned in some sources. This reduction in fuel cell size is a strategic decision to add more pit stops and introduce different pit strategies during a race.
The weight of fuel in a NASCAR race car is also influenced by the number of laps and the length of the track. Longer races or tracks with higher speeds will naturally require more fuel, increasing the overall fuel weight. Additionally, driving styles, racing surfaces, and tire wear can impact fuel mileage, making it a dynamic and complex factor in race strategy.
While NASCAR Cup Series cars do not have fuel gauges, teams use mathematical calculations, experience, and instinct to estimate fuel mileage. They consider factors such as track length, race distance, and past performance to make strategic decisions regarding fuel weight and pit stop timing. Ultimately, the weight of fuel in a NASCAR race car is a critical factor that requires careful consideration and strategic planning to optimize performance and increase the chances of victory.
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Fuel type
The fuel type used in NASCAR is crucial to the performance of the cars. The official fuel supplier for NASCAR is Sunoco, which provides different blends of racing gasoline known as Sunoco Green E15 fuel. This fuel is specifically designed to maximise horsepower, a critical factor in racing.
Sunoco engineers create a range of exotic fuel blends, tailored to the specific needs of different regions. For instance, fuel blends for northern states in winter may contain anti-icing agents, while blends for the southern states in summer may include anti-condensation or anti-algae growth agents to prevent fuel degradation in hot temperatures.
The racing fuel used by NASCAR has evolved over time. In the past, NASCAR vehicles utilised leaded gasoline. However, the organisation transitioned to the use of ethanol fuel, which is now the standard across the sport. This shift towards ethanol reflects a broader trend in motorsports, with IndyCar Series and Top Alcohol drag racing also adopting this fuel type.
The size of the fuel cans and cells in NASCAR vehicles is an important consideration. Fuel cans typically hold 12 gallons, while fuel cells have varied over time, with sizes of 17.75 gallons, 18 gallons, and 22 gallons mentioned across different sources. These fuel cells are strictly regulated to ensure that fuel mileage, rather than fuel capacity, is the determining factor in race outcomes.
NASCAR takes a stringent approach to controlling the fuel blend used during races. They specify that the fuel must be "automotive gasoline" and restrict it to "liquid hydrocarbons only". This control over the fuel blend extends to ensuring that no modifications are made to the fuel supplied by Sunoco for each race.
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Frequently asked questions
NASCAR fuel cans can hold 12 gallons of racing fuel.
NASCAR fuel cells can hold 17.75 gallons of fuel. However, fuel cells have previously held 22 gallons and some sources state that this is still the current size.
It is hard to know exactly how much fuel a NASCAR Cup Series car burns during a race as the cars are not equipped with fuel gauges. However, it is estimated that a Cup Series Next-Gen car uses an 18-gallon fuel tank. Fuel mileage depends on the track and the speeds the cars are running.
During the 2015 Daytona 500, a total of 5375 gallons of fuel was used by 43 cars.
