The 2015 Charger Scat Pack's Engine and Real-World Fuel Numbers

The 2015 Dodge Charger R/T Scat Pack came with a 5.7-liter V8 engine producing 370 horsepower. The EPA rated it at 16 miles per gallon in the city and 25 miles per gallon on the highway, with a combined rating of 19 mpg. These numbers assume regular unleaded gasoline (87 octane), though the engine was designed to run on premium fuel (91 octane or higher) for better performance.

Real-world fuel economy often differs from EPA estimates. Drivers report getting anywhere from 17 to 23 mpg combined, depending on driving habits, road conditions, and maintenance. Highway driving typically yields better mileage than city driving because the engine runs at lower RPMs and the transmission stays in higher gears for longer stretches.

Key Takeaways

  • The 2015 Charger Scat Pack's 5.7L V8 was rated at 16 city / 25 highway / 19 combined mpg by the EPA.
  • The engine meets EPA Tier 2 Bin 5 emissions standards, which were the federal requirement for that model year.
  • Using premium fuel (91 octane or higher) improves both fuel economy and engine performance compared to regular 87-octane fuel.
  • Actual fuel economy varies based on driving style, maintenance condition, and whether the vehicle is driven mostly in city or highway conditions.
  • The vehicle's emissions control system includes a catalytic converter and oxygen sensors that require periodic inspection to remain effective.

Emissions Standards the 2015 Scat Pack Met

The 2015 Charger Scat Pack was built to meet EPA Tier 2 Bin 5 emissions standards. These standards limit the amount of nitrogen oxides (NOx), particulate matter, and other pollutants the engine can emit during normal operation. Tier 2 standards were the federal baseline for all light-duty vehicles in 2015.

The vehicle's emissions control system includes a catalytic converter, which converts harmful gases into less harmful substances before they exit the tailpipe. It also has oxygen sensors that monitor the fuel-air mixture and help the engine computer adjust combustion to stay within emissions limits. These components work together to reduce smog-forming pollutants and greenhouse gases.

Premium Fuel Versus Regular Fuel: What Changes

The 2015 Scat Pack's engine has a compression ratio of 11.3:1, which means it compresses the fuel-air mixture more tightly than engines designed for regular fuel. Higher compression ratios require higher-octane fuel to prevent engine knock—a pinging sound that occurs when fuel ignites prematurely under pressure.

Using premium fuel (91 octane or higher) allows the engine to run at its intended timing and boost levels. This typically results in 2 to 3 mpg better fuel economy and noticeably stronger acceleration compared to running 87-octane regular fuel. The owner's manual recommends premium fuel, though the engine will run on regular fuel without damage—it will straightforward produce less power and slightly worse mileage.

Maintenance That Affects Emissions and Fuel Economy

Several maintenance items directly impact how efficiently the engine runs and how many emissions it produces. The engine air filter should be replaced every 15,000 to 30,000 miles; a clogged filter forces the engine to work harder and burns more fuel. The fuel filter typically lasts 30,000 to 50,000 miles before needing replacement.

Spark plugs on the 2015 Scat Pack are rated for 100,000 miles under normal driving conditions, but worn plugs increase fuel consumption and emissions. The oxygen sensors should be inspected at 80,000 miles; a failing sensor can cause the engine to run rich (too much fuel) and trigger the check engine light. Regular oil changes with the correct viscosity (5W-20 for the Scat Pack) also reduce engine friction and improve fuel economy by 1 to 2 percent.

How Driving Habits Change Fuel Economy

The way you drive has a larger effect on fuel economy than any single mechanical factor. Aggressive acceleration and hard braking can reduce mileage by 15 to 30 percent compared to steady, moderate driving. Idling for extended periods burns fuel without moving the vehicle; turning off the engine if you expect to wait more than 10 seconds saves fuel.

Tire pressure also matters: underinflated tires increase rolling resistance and reduce mileage by up to 3 percent per 5 psi below the recommended pressure. The 2015 Scat Pack's door jamb label lists the correct tire pressure for your specific vehicle. Highway driving at 55 to 65 mph typically yields better mileage than highway driving at 75 mph or higher, because aerodynamic drag increases sharply at higher speeds.

Comparing the Scat Pack to Other 2015 V8 Muscle Cars

The 2015 Charger Scat Pack's 19 mpg combined rating was competitive with other large V8 sedans from that year. The 2015 Dodge Challenger R/T (same engine, similar weight) was also rated at 19 mpg combined. The 2015 Chevrolet Camaro SS with its 6.2L V8 was rated at 17 mpg combined, and the 2015 Ford Mustang GT with its 5.0L V8 was rated at 18 mpg combined.

The Scat Pack's slightly better mileage than some competitors came partly from its transmission—an 8-speed automatic that kept the engine at lower RPMs on the highway compared to 6-speed automatics in competing vehicles. The trade-off was that the Scat Pack produced 370 horsepower, which was less than the Challenger SRT (375 hp) and Camaro SS (415 hp), but the Scat Pack was positioned as a more fuel-conscious performance option within Dodge's lineup.

Understanding the Window Sticker and EPA Ratings

The EPA window sticker on a new 2015 Charger Scat Pack showed the 16/25/19 mpg ratings, an estimated annual fuel cost, and a letter grade (A through D) for smog-forming emissions. The Scat Pack received a "Tier 2 Bin 5" designation, which was the standard for that model year. The sticker also noted the vehicle's greenhouse gas rating on a scale of 1 to 10.

These ratings are based on standardized EPA testing procedures, not real-world driving. The EPA test cycle includes city driving at moderate speeds and highway driving at steady speeds, with no aggressive acceleration or extreme conditions. Your actual mileage will vary based on your specific driving patterns, climate, and vehicle condition. The EPA provides a range (typically ±20 percent) to account for this variation.

Frequently Asked Questions

Will my 2015 Scat Pack pass a smog check?

Yes, if the vehicle is properly maintained. The emissions control system must be intact—no removed catalytic converters, no disconnected oxygen sensors, and no check engine light. A vehicle with a functioning emissions system and no fault codes will pass a standard smog test. If the check engine light is on, have the code read before testing.

What happens if I use regular fuel instead of premium?

The engine will run, but you'll lose about 2 to 3 mpg and notice reduced acceleration. The engine's computer will retard the ignition timing to prevent knock, which lowers power output. Occasional use of regular fuel won't damage the engine, but consistent use will cost you more in fuel over time despite the lower per-gallon price.

How often should I replace the air filter?

Check the air filter every 15,000 miles and replace it when it looks dirty or clogged. In dusty conditions, you may need to replace it more often. A clean air filter improves fuel economy by 1 to 2 percent and keeps the engine running smoothly.

Does the Scat Pack have a real-time mpg display?

Yes, the 2015 Scat Pack's instrument cluster includes a fuel economy display that shows current and average mpg. This display updates in real time and can help you adjust your driving habits to improve mileage. The display resets when you turn off the engine, though some models retain the average over multiple drive cycles.

What's the difference between the Scat Pack and the regular R/T?

The 2015 Charger R/T and Scat Pack both use the same 5.7L V8 engine and have the same EPA fuel economy ratings. The Scat Pack added performance upgrades like a performance suspension, larger brakes, and unique styling, but these don't change the engine's emissions or fuel consumption ratings.