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What is the fuel mileage on a 2023 6.6 gas?


The fuel mileage of a vehicle is a critical factor for many drivers, especially when considering the cost of fuel and the environmental impact of driving. The 2023 6.6L gas engine, commonly found in heavy-duty trucks like the Chevrolet Silverado 2500HD and GMC Sierra 2500HD, is designed for power and performance. But how does it fare in terms of fuel efficiency? Let’s dive into the details.


Understanding the 6.6L Gas Engine


The 6.6L V8 gas engine is a robust powertrain option for heavy-duty trucks. It delivers impressive horsepower and torque, making it ideal for towing and hauling. However, this power comes with a trade-off in fuel efficiency, as larger engines typically consume more fuel.


Fuel Mileage Estimates


While official EPA fuel economy ratings are not provided for heavy-duty trucks like those equipped with the 6.6L gas engine, real-world data and user reports give us a good idea of what to expect. Based on available information:



  • City Driving: The 2023 6.6L gas engine averages around 14-15 miles per gallon (MPG) in city conditions.

  • Highway Driving: On the highway, the fuel mileage improves slightly, averaging approximately 17-18 MPG.

  • Combined Driving: For mixed driving conditions, the combined fuel economy is typically around 15-16 MPG.


These figures can vary depending on factors such as driving habits, payload, towing, and road conditions. Drivers who frequently tow heavy loads may experience lower fuel efficiency.


Tips to Improve Fuel Efficiency


If you own a vehicle with a 6.6L gas engine and want to maximize your fuel mileage, here are some practical tips:



  • Maintain Proper Tire Pressure: Under-inflated tires can reduce fuel efficiency. Check your tire pressure regularly.

  • Avoid Excessive Idling: Idling consumes fuel without moving the vehicle. Turn off the engine if you expect to be stationary for an extended period.

  • Drive Smoothly: Avoid rapid acceleration and hard braking, as these behaviors can decrease fuel economy.

  • Reduce Excess Weight: Remove unnecessary items from your vehicle to reduce the load and improve efficiency.

  • Perform Regular Maintenance: Keep your engine tuned, replace air filters, and use the recommended grade of motor oil to ensure optimal performance.


By following these tips, you can make the most out of your 6.6L gas engine's fuel efficiency while enjoying its powerful performance.


Conclusion


The 2023 6.6L gas engine offers a balance of power and reasonable fuel efficiency for a heavy-duty truck. While it may not match the fuel economy of smaller engines or diesel alternatives, it remains a reliable choice for those who need robust towing and hauling capabilities. By adopting fuel-saving practices, you can further optimize your driving experience and reduce fuel costs.


Frequently Asked Questions

How long will a 6.6 gas engine last?


The average life expectancy of a 6.6 Duramax engine is around 200,000 miles or 320,000 km. Individual experiences may vary based on usage patterns, climate, and care. Regular oil changes, timely repairs, and adherence to recommended service intervals are essential for maximizing longevity.



What is the gas mileage on a 6.2 L V8 Denali?


22 mpg city/27 mpg highway
Denali 2023 GMC Sierra 1500 MPG Ratings: Reaches up to 24 mpg city/29 mpg highway, with engine choices including a 5.3L V8 or a 3.0L Duramax diesel. Denali Ultimate 2023 GMC Sierra 1500 Gas Mileage: Up to 22 mpg city/27 mpg highway, available with a 6.2L V8 engine or an optional 3.0L Duramax diesel.



How many miles per gallon does a GMC 2500 gas engine get?


In the city, the Sierra 2500 averages approximately 15 MPG.



What is the gas mileage on the GMC 2500HD 2023?


Based on data from 9 vehicles, 248 fuel-ups and 84,003 miles of driving, the 2023 GMC Sierra 2500 HD gets a combined Avg MPG of 15.40 with a 0.38 MPG margin of error.



How many miles per gallon does a 2024 GMC 2500 gas engine get?


Based on data from 97 vehicles, 2,428 fuel-ups and 872,317 miles of driving, the 2024 GMC Sierra 2500 HD gets a combined Avg MPG of 13.73 with a 0.13 MPG margin of error. Below you can see a distribution of the fuel-ups with 18 outliers (0.74%) removed.



What is the gas mileage on a 2500HD 6.6 gas?


You can expect the gas mileage of a Chevy 6.6 engine to vary, but without pulling anything you would get about 14 mpg on average.



What is the life expectancy of a 6.6 L V8 gas engine?


around 200,000 miles
The average life expectancy of a 6.6 Duramax engine is around 200,000 miles or 320,000 km. Individual experiences may vary based on usage patterns, climate, and care. Regular oil changes, timely repairs, and adherence to recommended service intervals are essential for maximizing longevity.



What is the fuel mileage on a 2023 6.6 gas engine?


We tested the Silverado 2500HD with the gasoline 6.6-liter V-8, and it earned 14 mpg on the highway. For comparison, we tested an F-250 with the gas-fed 6.2-liter V-8 and six-speed automatic transmission, and it returned 15 mpg in the same test.



Does the 6.6 gas engine require premium gas?


87 is just the minimum they require, you can always go higher as the computers will adjust, but its not needed.



What's better, 6.6 gas or diesel?


Diesel Engine (6.6L Duramax V8):
Higher towing capacity (up to 22,430 lbs) Significantly more torque (975 lb-ft) Better fuel efficiency. Longer engine lifespan.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.