Efficient Ram 1500 Inline-Six Engines Could Cost You More In Fuel Bills

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The High Output version, for example, requires at least 91-octane gasoline to operate correctly.

The Hurricane inline-six engines found in the updated 2025 Ram 1500 trucks are lighter and more efficient than their V8 predecessors but may not be cheaper to run due to differing octane ratings.

The new Ram 1500 was revealed last year and no longer has a V8 option. The new inline-six engines promise the same power and performance while offering superior fuel economy. Ram has yet to provide mpg estimates for the new engine, but minor improvements have been noted in the Jeep Wagoneer and Grand Wagoneer models. The Grand Wagoneer 4WD with the V8 returns an EPA-estimated 15 mpg on the combined cycle, while the more powerful turbocharged six-cylinder delivers an additional two mpg.

5thGenRams got hold of the 2025 1500 owner's manual, which gives us some unique insights into the new pickup and its engines.

2025 Ram 1500 Driving Front Angle Stellantis

The 5.7-liter V8 could happily run on 87-octane fuel, but Ram recommended customers at least use 89-octane if they wanted to benefit from the engine's full outputs of 390 horsepower and 410 lb-ft of torque. It seems the Standard Output Hurricane engine has the same requirements.

According to the owner's manual, the Standard Output engine was designed to meet emissions requirements and provide acceptable fuel economy when using regular gasoline with an octane rating of 87. But like the Hemi, 91 or higher is required for stronger performance. "This increase in performance is most noticeable in hot weather or under heavy load conditions such as while towing," reads the manual.

This means the Standard Output model can still be run on cheaper 87-octane fuel while returning improved fuel economy figures. As a reminder, this motor produces an impressive 420 horsepower and 469 lb-ft of torque in its basic form.

2025 Ram 1500 Engine Bay Stellantis

However, it's a different story with the High Output version of the Hurricane inline-six. According to the owner's manual, this state of tune requires the use of 91-octane fuel at minimum. "The use of 91 or higher octane premium gasoline is required in this engine," says the engine instructions.

The minimum fuel grade also unleashes the full 540 hp and 521 lb-ft that the Hurricane six is capable of producing. In this case, the higher fuel costs associated with 91-octane may offset any minor mpg improvements compared to the Hemi V8, which can run on 87-octane. Still, the newer model does emit fewer emissions, which is always a good thing.

If efficiency is your main concern, let's not forget the Ram lineup will grow to include the Ramcharger and the fully electric REV variant.

2025 Ram 1500 Rear Angle View Stellantis

Of course, you could also opt for the Standard Output version and use 87-octane fuel.

It is worth noting that the Standard Output engine is standard on the Rebel and Laramie trims. For an additional $2,695, Ram will also equip the Big Horn and Tradesman variants with this motor. While the V8 has died, Stellantis is keeping the base 3.6-liter V6 for now.

Buyers must opt for the Limited, Limited Longhorn, and Tungsten models to get the mighty power of the High Output inline-six. These trims are obviously more expensive, and in the case of the Tungsten, buyers can expect to pay $90,000.

Interestingly, the best towing capacity is offered in combination with the Standard Output motor; a maximum of 11,560 lbs is available on specific models, eclipsing the best High Output towing figure by 820 lbs.

2025 Ram 1500 Driving Front Angle Stellantis

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