What the Dodge Charger SRT 392 is and how it performs

The Dodge Charger SRT 392 is a high-performance sedan powered by a 6.4-liter V8 engine that produces 485 horsepower and 475 pound-feet of torque. It's built on the same platform as the standard Charger but with a larger, more powerful engine and reinforced suspension and braking systems designed to handle that power. The SRT 392 accelerates from 0 to 60 mph in roughly 3.6 to 3.8 seconds, depending on transmission type and driving conditions.

The engine itself is naturally aspirated—meaning it draws air without a turbocharger or supercharger—and uses a traditional eight-cylinder layout. This engine is the same one found in the Dodge Challenger SRT 392 and other high-performance Dodge vehicles. The SRT 392 comes with either a five-speed automatic transmission or, in some model years, an eight-speed automatic, both rear-wheel drive.

Key Takeaways

  • The SRT 392 engine is a 6.4-liter naturally aspirated V8 that produces 485 horsepower and requires premium (91 or 93 octane) gasoline.
  • Real-world fuel economy ranges from 14 to 16 miles per gallon in city driving and 23 to 25 miles per gallon on highways, depending on driving habits and transmission.
  • The vehicle emits approximately 10.3 to 10.5 metric tons of CO2 per year under typical driving patterns, placing it in the highest emissions category for passenger vehicles.
  • The SRT 392 does not meet modern emissions standards for nitrogen oxides and particulates without aftertreatment systems, which vary by model year and market.

Fuel economy and real-world consumption

The EPA estimates the Dodge Charger SRT 392 achieves 14 miles per gallon in city driving, 25 miles per gallon on the highway, and 18 miles per gallon combined. These figures assume normal driving with the five-speed automatic transmission. The eight-speed automatic, available in later model years, may achieve slightly better highway fuel economy, though city figures remain similar.

Real-world consumption depends heavily on driving style. Aggressive acceleration, frequent hard braking, and sustained high speeds all reduce fuel economy below EPA estimates. Owners who drive conservatively on highways report figures closer to 24 to 25 mpg, while those who drive in stop-and-go city traffic or use the engine's full power regularly report 12 to 14 mpg. The SRT 392 requires premium gasoline (91 or 93 octane, depending on your region), which costs more than regular unleaded.

Over a year of typical driving—roughly 12,000 to 15,000 miles—you can expect to spend between $2,200 and $2,800 on fuel at current prices, assuming an average of 18 mpg combined and premium fuel costs of $3.50 to $4.00 per gallon. This figure varies significantly by region and individual driving patterns.

Carbon dioxide emissions and annual environmental impact

The Dodge Charger SRT 392 produces approximately 10.3 to 10.5 metric tons of carbon dioxide per year under typical driving patterns of 12,000 to 15,000 miles annually. This calculation is based on the EPA's combined fuel economy rating of 18 mpg and the standard conversion that burning one gallon of gasoline produces roughly 19.6 pounds of CO2.

To put this in context, the average passenger car in the United States produces 4.6 metric tons of CO2 per year. The SRT 392 produces more than double that amount, placing it among the highest-emitting vehicles in the passenger car category. A mid-size sedan with a turbocharged four-cylinder engine typically produces 5 to 6 metric tons annually, while a hybrid sedan produces 2 to 3 metric tons.

Over the vehicle's typical lifespan of 150,000 to 200,000 miles, a Charger SRT 392 will emit roughly 150 to 200 metric tons of CO2, assuming consistent fuel economy and annual mileage. This does not include emissions from manufacturing, transportation, or fuel refining—only the tailpipe emissions from driving.

Emissions standards and pollutants beyond carbon dioxide

The Dodge Charger SRT 392 must meet federal emissions standards for nitrogen oxides (NOx), particulate matter, and volatile organic compounds. The specific standards depend on the model year and whether the vehicle was sold in California or the rest of the United States, as California has stricter limits than federal standards.

Vehicles from 2016 onward must meet Tier 3 standards, which limit NOx emissions to 30 milligrams per mile for light-duty vehicles. The SRT 392 uses a three-way catalytic converter and oxygen sensors to reduce these pollutants, but a large naturally aspirated V8 engine produces more NOx than smaller, turbocharged engines because combustion temperatures are higher. Particulate matter from gasoline engines comes primarily from incomplete combustion and is controlled through fuel injection timing and catalytic conversion.

The vehicle also produces carbon monoxide and unburned hydrocarbons, both controlled by the catalytic converter. Real-world emissions can exceed EPA test-cycle estimates if the vehicle is poorly maintained, has a faulty oxygen sensor, or uses fuel that does not meet specifications.

How the SRT 392 compares to other high-performance vehicles

The Dodge Charger SRT 392 produces more CO2 per year than most competitors in the American muscle car category, but less than some. A Chevrolet Camaro SS with a 6.2-liter V8 produces similar emissions (around 10.2 metric tons annually), while a Ford Mustang GT with a 5.0-liter V8 produces slightly less (around 9.8 metric tons). A Dodge Challenger SRT 392, which uses the same engine, produces identical emissions.

Compared to imported sports cars, the SRT 392 is competitive. A BMW M440i xDrive with a turbocharged six-cylinder produces roughly 9.5 metric tons of CO2 annually, while a Porsche 911 Carrera with a turbocharged six-cylinder produces around 10.1 metric tons. The key difference is that imported sports cars often achieve slightly better fuel economy despite similar horsepower, due to lighter weight and more efficient turbocharging.

Hybrid and electric alternatives in the performance category produce far less. A Tesla Model 3 Performance produces zero tailpipe emissions and roughly 2 to 3 metric tons of CO2 annually when accounting for electricity generation, depending on your region's power grid mix.

Maintenance and emissions system durability

The catalytic converter and oxygen sensors on the SRT 392 are the primary components that control emissions. These parts typically last 80,000 to 100,000 miles under normal driving conditions, though they can fail earlier if the engine runs too rich (too much fuel relative to air) or if the vehicle is driven with a check engine light illuminated.

Regular maintenance—oil changes every 5,000 to 7,500 miles, air filter replacement every 15,000 to 30,000 miles, and fuel system cleaning every 30,000 to 50,000 miles—helps keep the emissions system functioning properly. A faulty oxygen sensor or a clogged air filter can increase emissions and reduce fuel economy. If the check engine light comes on, the vehicle should be scanned for diagnostic trouble codes, which often point to emissions system problems.

Aftermarket modifications that remove or disable emissions equipment are illegal in all 50 states and can result in fines. Even "tuning" the engine to increase horsepower often increases emissions and can trigger emissions test failures in states that conduct inspections.

Frequently Asked Questions

Does the Dodge Charger SRT 392 pass emissions tests?

Yes, the SRT 392 meets federal and state emissions standards when properly maintained. However, in states that conduct tailpipe emissions testing (like California, New York, and Massachusetts), a vehicle with a faulty catalytic converter or oxygen sensor may fail. Regular maintenance and prompt repair of any check engine light issues will keep the vehicle compliant.

Can I reduce the SRT 392's fuel consumption?

Driving conservatively—avoiding rapid acceleration, maintaining steady speeds, and keeping tire pressure at the manufacturer's recommended level—can improve fuel economy by 1 to 3 mpg. Removing excess weight from the vehicle and using the recommended premium fuel also help. However, the engine's design limits how much improvement is possible; you will not achieve 25 mpg in city driving regardless of technique.

What is the difference between the SRT 392 and the R/T model?

The Charger R/T uses a 5.7-liter V8 that produces 370 horsepower and achieves roughly 15 mpg combined, producing about 8.5 metric tons of CO2 annually. The SRT 392's larger engine produces 485 horsepower but consumes more fuel and emits more CO2. The R/T is the more fuel-efficient choice if performance is secondary to economy.

How do I know if my SRT 392's emissions system is working?

The check engine light is the primary indicator. If it is illuminated, the vehicle should be scanned with a diagnostic tool to identify the specific problem. Additionally, if you notice a rotten egg smell from the exhaust, the catalytic converter may be failing. A mechanic can perform an emissions test to verify the system is functioning within legal limits.