The 2012 Dodge Charger's EPA ratings and real-world fuel use

The 2012 Dodge Charger came with three engine options, and each had different fuel economy ratings. The base model used a 3.6-liter V6 that the EPA rated at 17 miles per gallon in the city and 27 on the highway, for a combined 21 mpg. The mid-level 5.7-liter V8 was rated at 15 city, 25 highway, and 19 combined. The high-performance 6.4-liter SRT8 V8 was rated at 14 city, 23 highway, and 18 combined. These are EPA estimates — actual mileage depends on driving habits, road conditions, and how well the engine is maintained.

Real-world fuel economy often runs lower than EPA estimates, especially in city driving. Owners of 2012 Chargers with the V6 commonly reported 18 to 20 mpg combined, while V8 owners often saw 16 to 18 mpg. Aggressive acceleration, idling, and stop-and-go traffic all pull the numbers down. Highway driving at steady speeds tends to come closer to EPA estimates.

Key Takeaways

  • The 2012 Charger's fuel economy ranges from 18 to 21 mpg combined depending on engine size, with the V6 being the most efficient option.
  • EPA estimates are laboratory tests and often run higher than what owners experience in daily driving, particularly in cities.
  • The 2012 Charger uses regular unleaded gasoline in the V6 and V8 models, while the SRT8 requires premium fuel.
  • Emissions standards for 2012 model year vehicles reflect federal regulations in place at that time, which are less strict than current standards.

Fuel type and tank capacity

The 2012 Dodge Charger with the 3.6-liter V6 and the standard 5.7-liter V8 both run on regular unleaded gasoline (87 octane). The high-performance 6.4-liter SRT8 requires premium unleaded fuel (91 octane or higher) to avoid engine knock and maintain performance. Using regular fuel in an SRT8 can damage the engine over time and will trigger the check engine light.

All 2012 Chargers came with an 18-gallon fuel tank. At the EPA-rated combined fuel economy, this means a V6 model could travel roughly 378 miles on a full tank, while a V8 would go about 342 miles, and an SRT8 about 324 miles. These are theoretical maximums based on EPA ratings and will vary with actual driving.

Emissions standards and what they mean

The 2012 Dodge Charger was built to meet the Tier 2 Bin 5 emissions standard, which was the federal requirement for that model year. This standard limits the amount of nitrogen oxides (NOx), particulate matter, and other pollutants the vehicle can emit. The 2012 standard is less restrictive than current emissions rules — vehicles made today must meet Tier 3 standards, which are significantly stricter.

All 2012 Chargers came equipped with a catalytic converter and an onboard diagnostic system (OBD-II) that monitors emissions equipment. If any emissions component fails, the check engine light comes on. A functioning catalytic converter is required for the vehicle to pass a state emissions test in most places that conduct them.

Maintenance that affects fuel economy and emissions

Several routine maintenance items directly affect how much fuel your 2012 Charger uses and how clean its emissions are. A clogged air filter forces the engine to work harder and burns more fuel — replacing it every 15,000 to 30,000 miles keeps efficiency up. Spark plugs should be checked at 30,000 miles and replaced if worn; fouled plugs reduce fuel economy and increase emissions.

Tire pressure also matters. Underinflated tires create more rolling resistance, which means the engine burns more fuel to maintain speed. Check tire pressure monthly and keep it at the manufacturer's recommended level, which is printed on a sticker inside the driver's door jamb. A wheel alignment problem can have the same effect — if the vehicle pulls to one side, the tires are fighting each other and fuel economy drops.

The oxygen sensors (there are typically two or four, depending on engine) monitor exhaust gases and tell the engine computer how to adjust the fuel mixture. Worn oxygen sensors cause the engine to run rich (too much fuel) and trigger the check engine light. Replacing them when they fail restores fuel economy and reduces emissions.

What the emissions test checks

In states that require emissions testing, a 2012 Charger is typically tested using the OBD-II scan tool, which reads the vehicle's onboard computer for emissions-related fault codes. The test does not measure tailpipe emissions directly for most vehicles — it checks whether the emissions control system is working and whether any fault codes are stored. A vehicle with an illuminated check engine light will fail this test.

Some states still use tailpipe testing, which measures actual pollutants coming out of the exhaust. For a 2012 Charger to pass, the catalytic converter must be functioning, the oxygen sensors must be working, and the engine must be in good tune. A vehicle that runs rough, hesitates, or has poor fuel economy is more likely to fail a tailpipe test.

Comparing the three engine options

The V6 is the most fuel-efficient and least expensive to operate, making it the practical choice for daily commuting. It produces 250 horsepower and handles highway driving smoothly, though it is noticeably slower off the line than the V8 models. Insurance premiums are typically lower for the V6 as well.

The standard 5.7-liter V8 produces 370 horsepower and offers a significant performance step up while still being reasonably economical for a V8. It is the most common engine in the 2012 Charger lineup and parts are widely available. Fuel economy is acceptable for a full-size sedan with this power level.

The 6.4-liter SRT8 produces 470 horsepower and is built for performance, not efficiency. It requires premium fuel, which costs more at the pump. Insurance is substantially higher, and fuel economy is the lowest of the three. This engine is the choice for drivers who prioritize acceleration and handling over operating costs.

Frequently Asked Questions

Can I improve the fuel economy of my 2012 Charger?

Regular maintenance is the most effective step — clean air filters, fresh spark plugs, and proper tire pressure all help. Driving habits matter significantly: smooth acceleration, maintaining steady highway speeds, and avoiding excessive idling can improve mileage by 10 to 15 percent. Aftermarket modifications like cold air intakes or exhaust systems may claim to improve economy, but results are typically minimal and can affect emissions compliance.

What does it mean if my check engine light is on?

The light indicates the onboard diagnostic system has detected a fault in the engine, emissions, or transmission system. It could be something minor like a loose gas cap or something serious like a failing oxygen sensor. You will need to have the fault code read with a diagnostic scanner to know what needs attention. The vehicle may still run, but it will fail an emissions test.

Is the 2012 Charger more polluting than newer cars?

Yes, it produces more emissions than current vehicles because it meets older standards. A well-maintained 2012 Charger with a functioning catalytic converter and no fault codes will pass state emissions tests in most places, but it emits more nitrogen oxides and particulate matter than a 2024 model. The difference is most noticeable in cities with heavy traffic.

What octane fuel should I use in my V6 or V8?

Regular unleaded (87 octane) is correct for both the V6 and the standard V8. Using premium fuel in these engines provides no benefit and wastes money. The SRT8 requires premium (91 octane or higher) because the engine is tuned for higher compression. Using regular in an SRT8 can cause engine knock and long-term damage.

How often should I get an emissions test?

That depends on your state. Some states test every year, others every two years, and some do not test at all. Check your state's Department of Environmental Quality or equivalent agency for the schedule in your area. A 2012 Charger in good working order with no check engine light should pass without issue.