EPA Fuel Economy: 18 MPG Combined

The 2021 RAM 1500 5.7L V8 Crew Cab delivers an EPA-estimated combined fuel economy rating of 18 MPG, making it a respectable choice for full-size pickup truck owners who prioritize performance and towing capability. This combined rating reflects a balanced average between city and highway driving conditions, providing a realistic expectation for owners who use their truck for a mix of urban commuting and longer highway journeys. With the muscular 5.7L V8 engine paired to an 8-speed automatic transmission, this configuration prioritizes power and torque delivery while maintaining reasonable fuel efficiency for its class.

For truck buyers comparing options in the full-size segment, the 18 MPG combined rating represents a solid baseline. The 8-speed automatic transmission plays a crucial role in achieving this efficiency level, allowing the engine to operate in higher gears during cruising and optimize fuel consumption across various driving scenarios. RAM’s engineering in the 2021 model year reflects improvements in aerodynamics and transmission technology that help maximize every gallon of fuel, even with a large-displacement V8 engine under the hood.

City vs Highway Performance

The 2021 RAM 1500 5.7L V8 Crew Cab achieves 15 MPG in city driving and 22 MPG on the highway, highlighting a significant difference between urban and highway conditions. City driving demands frequent acceleration, braking, and idling, which reduces fuel economy considerably. The 15 MPG city rating reflects the realities of stop-and-go traffic where the V8 engine works harder and spends less time in optimal fuel-efficient operating ranges. Drivers in dense urban areas or with frequent short trips should anticipate fuel consumption closer to this 15 MPG figure.

Highway driving reveals the truck’s efficiency potential, with the 22 MPG rating demonstrating how the 5.7L V8 performs when cruising at steady speeds. On the highway, the 8-speed transmission locks into higher gears where the engine operates more efficiently, reducing fuel consumption per mile traveled. This 7 MPG improvement over city driving shows why long-distance trips in a RAM 1500 prove more economical than primarily local use. The difference between 15 and 22 MPG is typical for full-size trucks and reflects how driving conditions dramatically impact fuel consumption.

Annual Fuel Cost

Based on EPA estimates and typical driving patterns, here’s the annual fuel cost calculation for the 2021 RAM 1500 5.7L V8 Crew Cab:

Annual Fuel Cost Calculation:

Miles driven annually: 15,000
Combined EPA rating: 18 MPG
Current fuel price: $3.50 per gallon

Gallons needed per year: 15,000 miles ÷ 18 MPG = 833 gallons
Annual fuel cost: 833 gallons × $3.50 = $2,916

This calculation assumes consistent mixed driving that averages to the EPA combined rating of 18 MPG. Drivers who spend more time in city conditions may see annual costs increase, while those with primarily highway miles might see costs decrease. Fuel prices fluctuate based on market conditions, so this estimate reflects current pricing and will vary accordingly.

Real-World MPG Expectations

Real-world fuel economy for the 2021 RAM 1500 5.7L V8 Crew Cab often varies from EPA estimates depending on individual driving habits, vehicle maintenance, and load conditions. Many owners report achieving results within 1-2 MPG of the EPA combined rating under normal driving conditions, though aggressive acceleration and heavy towing will reduce efficiency. The loaded truck with passengers and cargo will consume more fuel than the EPA baseline, as the engine must work harder to move additional weight.

To maximize fuel economy with this V8 engine, maintain steady driving speeds, avoid excessive idling, and keep tire pressure at recommended levels. Regular maintenance, including clean air filters and proper engine tune-up, helps the 5.7L engine operate at peak efficiency. Highway driving at moderate speeds yields better fuel economy than city driving, and minimizing rapid acceleration preserves fuel consumption. Off-road driving or towing a trailer will significantly impact MPG, sometimes dropping efficiency by 2-4 MPG depending on conditions and payload.

How It Compares

Compared to competing full-size V8 trucks, the 2021 RAM 1500 5.7L Crew Cab’s 18 MPG combined rating is competitive. The Ford F-150 5.0L V8 achieves similar 18-19 MPG combined ratings with comparable engine displacement. The 2021 Chevrolet Silverado 1500 6.2L V8 delivers roughly 16-17 MPG combined, making the RAM slightly more efficient. The RAM 1500’s 8-speed transmission provides an advantage over some competitors still using 6-speed or 9-speed units, contributing to its respectable efficiency numbers within the full-size pickup segment.

Tips to Maximize Efficiency

• Maintain steady speeds: Cruising at consistent highway speeds allows the 8-speed transmission to remain in higher gears, optimizing the V8’s fuel consumption.
• Reduce excess weight: Remove unnecessary cargo and equipment from the truck bed, as extra weight forces the 5.7L engine to work harder.
• Use regular maintenance schedules: Keep up with oil changes, air filter replacements, and spark plug inspections to ensure the engine operates efficiently.
• Avoid aggressive acceleration: Gradual acceleration reduces fuel consumption significantly compared to hard throttle inputs with a large V8.
• Monitor tire pressure: Properly inflated tires reduce rolling resistance and improve overall fuel economy across all driving conditions.

Frequently Asked Questions

Q: Can I improve the 18 MPG combined rating with modifications?
A: Aftermarket performance modifications typically reduce fuel economy rather than improve it. Cold air intakes and exhaust upgrades may sacrifice efficiency for power gains. Stock maintenance is your best approach for achieving EPA-estimated figures.

Q: How does towing affect the 22 MPG highway rating?
A: Towing a trailer significantly reduces fuel economy, often dropping highway MPG by 3-5 MPG depending on trailer weight and aerodynamics. Plan for considerably higher fuel consumption when towing with the 5.7L engine.

Q: Is 15 city MPG typical for the RAM 1500 5.7L engine?
A: Yes, 15 MPG city is the EPA estimate for this model. Actual results depend on traffic patterns, driving aggressiveness, and vehicle load, but most owners report results near this figure in urban conditions.

The 2021 RAM 1500 5.7L V8 Crew Cab offers truck buyers a powerful, capable vehicle with reasonable fuel economy for its class. Understanding the EPA ratings and real-world expectations helps owners plan fuel budgets and driving strategies accordingly.