Engine options and fuel consumption on the 2015 Charger SE

The 2015 Dodge Charger SE came with two engine choices, and which one you have determines how much fuel you'll use. The standard engine was a 3.6-liter V6 that produced 292 horsepower. The optional engine was a 5.7-liter V8 that produced 370 horsepower. Both were paired with an eight-speed automatic transmission.

The V6 version achieved an EPA-estimated 25 miles per gallon on the highway, 16 miles per gallon in the city, and 19 miles per gallon combined. The V8 version was less efficient: 25 highway, 15 city, and 19 combined. Real-world fuel economy depends on your driving habits, road conditions, and how well you maintain the vehicle, so your actual numbers may differ from these estimates.

Both engines ran on regular unleaded gasoline (87 octane), which was the least expensive fuel grade available at most pumps. The fuel tank held 18.5 gallons, giving the V6 a theoretical range of around 350 miles per tank and the V8 around 350 miles as well, though the V8 would typically need refueling sooner in real driving.

Key Takeaways

  • The 2015 Charger SE offered a 3.6-liter V6 as standard and a 5.7-liter V8 as an option, with the V6 being slightly more fuel-efficient.
  • EPA estimates showed 19 miles per gallon combined for both engines, though highway driving was more efficient than city driving for each.
  • Both engines used regular unleaded gasoline and shared an 18.5-gallon fuel tank.
  • Actual fuel economy varies based on driving style, maintenance, and road conditions, so EPA estimates serve as a baseline rather than a may provide.

Emissions standards the 2015 Charger SE met

The 2015 Dodge Charger SE was built to meet federal emissions standards set by the Environmental Protection Agency (EPA) and California emissions standards, which are stricter than federal requirements. The vehicle carried a Tier 2, Bin 5 emissions rating, which means it produced nitrogen oxides and particulate matter within the limits set for that category.

Both the V6 and V8 engines included catalytic converters and oxygen sensors to reduce harmful exhaust gases before they left the tailpipe. The vehicle also had an evaporative emissions control system to prevent fuel vapors from escaping into the atmosphere. These systems were standard equipment, not optional upgrades.

The 2015 model year fell under the same emissions rules as 2014 and 2016 Chargers, so if you're comparing across those years, the environmental standards were consistent. Vehicles from this era were not subject to the stricter emissions standards that took effect in 2017 and later model years.

How the transmission affects emissions output

The eight-speed automatic transmission in the 2015 Charger SE played a role in keeping emissions down. More gears allowed the engine to operate at lower RPMs during highway driving, which reduced fuel consumption and the amount of exhaust produced. When the engine burns less fuel, it produces fewer emissions overall.

The transmission also included a torque converter lockup feature that engaged at highway speeds, further improving efficiency. This meant the engine and transmission were mechanically linked rather than using fluid coupling, reducing energy loss and lowering fuel consumption during steady-speed driving.

Maintenance items that affect emissions performance

Several routine maintenance tasks directly impact how much pollution your 2015 Charger SE produces. The most important is replacing the engine air filter according to the manufacturer's schedule, typically every 15,000 to 30,000 miles depending on driving conditions. A clogged air filter forces the engine to run rich (using more fuel than necessary), which increases emissions.

Spark plugs also matter: worn or fouled plugs cause incomplete combustion, which means more unburned fuel exits the tailpipe as pollution. The 2015 Charger SE used spark plugs rated for 100,000 miles, but checking them at 60,000 miles is reasonable if you drive in dusty conditions or tow frequently.

Oil changes on schedule keep the engine running cleanly. Dirty oil increases friction and forces the engine to work harder, burning more fuel and producing more emissions. Using the correct oil grade (5W-20 for the V6, 5W-20 for the V8) matters as well, since thicker or thinner oil than specified increases drag.

The catalytic converter and oxygen sensors should be inspected if your check engine light comes on. A failing oxygen sensor can cause the engine to run too rich or too lean, both of which increase emissions. A damaged catalytic converter loses its ability to convert harmful gases, allowing them to pass directly into the atmosphere.

What the window sticker told you about environmental impact

When the 2015 Charger SE was new, the Monroney label (the window sticker) included an EPA environmental impact section. This section showed the vehicle's fuel economy rating, annual fuel cost estimate based on national average gas prices at the time, and a comparison to other vehicles in the same class.

The sticker also displayed a "SmartWay" designation if the vehicle met certain emissions and efficiency thresholds, though not all 2015 Chargers carried this label. The sticker made it straightforward to compare the environmental footprint of the Charger SE against other midsize sedans available that year.

Comparing the 2015 Charger SE to other sedans of that era

Among full-size American sedans in 2015, the Charger SE's fuel economy was typical. The Chevrolet Impala with a V6 achieved similar numbers (25 highway, 17 city, 20 combined), while the Chrysler 300 with a V8 was slightly less efficient. Japanese competitors like the Toyota Avalon and Nissan Maxima achieved better fuel economy overall, typically in the 21 to 26 combined range depending on engine choice.

The trade-off was performance: the Charger's V8 option offered more horsepower than most competitors in the same price range, which came at the cost of higher fuel consumption and emissions. Buyers choosing the V6 were closer to the efficiency of mid-size sedans, though the Charger's larger size and weight meant it still used more fuel than compact or intermediate models.

Frequently Asked Questions

Does the 2015 Charger SE pass modern emissions tests?

The 2015 Charger SE meets the emissions standards that were in effect when it was built, but it does not meet current standards in states like California that have adopted stricter rules for newer model years. Whether it passes your state's emissions test depends on your state's requirements and the vehicle's condition. A well-maintained Charger should pass a standard emissions inspection in most states.

Can I improve the fuel economy of my 2015 Charger SE?

Keeping up with maintenance—air filter, spark plugs, oil changes, and tire pressure—will help the engine run at its designed efficiency. Driving habits matter too: aggressive acceleration and highway speeds above 60 mph reduce fuel economy. Removing excess weight from the trunk and avoiding idling also help, though these changes are modest compared to the effect of engine choice.

What does Tier 2, Bin 5 emissions mean?

Tier 2 is a federal emissions standard that groups vehicles by how much nitrogen oxides they produce. Bin 5 is a category within that tier. Your 2015 Charger SE produces nitrogen oxides within the limits set for Bin 5 vehicles. Higher bins (like Bin 8 or 9) allow more emissions; lower bins (like Bin 2 or 3) are stricter and typically found on hybrid or electric vehicles.

Is the V6 or V8 better for the environment?

The V6 is slightly better: it achieves the same 19 combined miles per gallon as the V8 but uses a smaller engine, so it produces fewer total emissions over time. However, the difference is modest. If you drive mostly highway, both engines perform similarly. If you drive mostly city, the V6's 16 city rating versus the V8's 15 city rating shows a small advantage for the smaller engine.