There is no official Ram 2500 fuel economy rating in Canada. Vehicle manufacturers are not required to submit fuel consumption data for pickup trucks with a gross vehicle weight rating (GVWR) of more than 3,856 kg (8,500 lb) and an interior bed length of 183 cm or more, so Natural Resources Canada says those trucks are not tested and their ratings do not appear in its fuel consumption ratings search tool or on the EnerGuide label, and its 2026 ratings file lists the Ram 1500 and no Ram 2500. That goes for the 6.4 HEMI and the 6.7 Cummins High Output alike, so the figure worth having is the one you measure yourself; compare both engines in our new Ram 2500 inventory.
What you can work with is Ram Canada's engine and fuel tank figures and a simple two fill up log. If you are still choosing an engine, our Ram 2500 diesel versus gas comparison sets the 6.4 HEMI against the 6.7 Cummins High Output on pulling and payload.
Key Takeaways
- There is no official rating to quote. Natural Resources Canada says manufacturers are not required to submit fuel consumption data for pickups over 3,856 kg GVWR with an interior bed of 183 cm or more, and its 2026 ratings file lists no Ram 2500.
- Ram Canada lists engines, not litres per 100 km. For 2026: the 6.4 HEMI (405 horsepower, 429 lb ft) or the available 6.7 Cummins High Output (1,075 lb ft of torque), with no fuel figure for either.
- Ram Canada lists the tanks. Its 2026 trim cards show 121.1 litres on the two door models and 117.3 litres on the Crew Cab models they describe, with the 6.4 HEMI, and the window sticker shows the tank on a particular truck.
- Measure your own over two fill ups. Divide the litres by the kilometres and multiply by 100, and log empty weeks and loaded weeks separately.
- Winter costs fuel. Natural Resources Canada says idling for more than 30 seconds has no benefit for the vehicle, and recommends a block heater on a timer, used the way your vehicle's manufacturer directs.
Why the Ram 2500 Has No Official Fuel Rating in Canada
Natural Resources Canada's fuel consumption testing page says vehicle manufacturers are not required to submit fuel consumption data for "pickup trucks with a GVWR of more than 3,856 kg (8,500 lbs.) and an interior bed length of 183 cm (72 in.) or more." For those trucks, it says, the ratings "do not appear in the fuel consumption ratings search tool or on the EnerGuide label."
The GVWR for a specific truck is printed on the label in its driver's door jamb, and that number tells you which side of the line the truck sits on. Natural Resources Canada's 2026 Fuel Consumption Ratings file lists Ram 1500 rows and no Ram 2500. So a precise Ram 2500 number you find quoted somewhere is not a Canadian rating.
For a 2025 or earlier Ram 2500, look up that model year in Natural Resources Canada's fuel consumption ratings search tool; a truck above the line will not be there. For a 2027 Ram 2500, Natural Resources Canada's open data lists no 2027 ratings file at the time of writing, so read the window sticker. The half ton is different: the 2026 Ram 1500 does carry federal ratings, and our Ram 1500 fuel economy guide lists them engine by engine. Our gas versus diesel post for the Ram 1500 covers when stepping up to a Ram 2500 diesel makes sense.
What Ram Canada Lists: Engines and Fuel Tanks
For the 2026 Ram 2500, Ram Canada lists two engines:
- 6.4 HEMI V8: 405 horsepower and 429 lb ft of torque, standard.
- 6.7 Cummins High Output turbo diesel: 1,075 lb ft of torque, available.
On fuel tanks, Ram Canada's 2026 Ram 2500 trim cards show a 121.1 litre tank on the two door models and a 117.3 litre tank on the Crew Cab models they describe, with the 6.4 HEMI. The tank on a particular truck depends on how it was built; its window sticker lists it.
Ram Canada does not publish a range figure. Once you have a measured figure, work out your own: divide the tank size in litres by your L/100 km and multiply by 100. Leave a reserve, because some rural Manitoba highways have long stretches between fuel stops, and nobody wants to run out of fuel on a grid road in January. If you would rather hear real world numbers before you buy, ask our service team what owners report.
How to Measure Your Own Ram 2500 Fuel Economy
This works for the 6.4 HEMI and the 6.7 Cummins the same way.
- Fill the tank and stop at the first automatic shutoff. Use the same station, and the same pump if you can.
- Reset the trip odometer before you pull away.
- Drive the truck the way you normally do until it needs fuel.
- Fill again to the first shutoff, and write down the litres on the pump and the kilometres on the trip.
- Divide the litres by the kilometres and multiply by 100. If the pump shows 80 litres and the trip shows 500 km, that is 80 ÷ 500 × 100 = 16.0 L/100 km. Those numbers show the arithmetic only; they are not a figure for any Ram 2500.
- Do it over two fill ups and add the litres and kilometres together before you divide, so one windy tank does not skew the result.
Check tire pressure against the door placard before you start. Natural Resources Canada says that "driving a vehicle with tires under-inflated by 56 kilopascals (8 pounds per square inch) can increase fuel consumption by up to 4%. It can also reduce the life of your tires by more than 10,000 kilometres." If you would like a hand with it, ask our service team when you book a service visit online.
On a Cummins, diesel exhaust fluid is bought separately and is not part of the litres you log at the pump, so give it its own column; our Cummins DEF guide covers the fluid itself.
Loaded Versus Empty: The Portage to Winnipeg Test
A heavy duty truck switches between empty and working, and a single average hides that. Keep two logs: one over weeks when the box is empty, one over weeks when it carries a load or pulls a trailer, for example the Trans-Canada Highway run from Portage la Prairie into Winnipeg and back with a pallet of feed in the box or a stock trailer behind. Compare the two figures, and the difference is what the load costs on your truck, with your trailer, at your speed.
A box full of weight, a tall trailer and a headwind on the open stretch past Elie can all push consumption up. If you tow, read the trailer's loaded weight against Ram Canada's maximums before you worry about litres; our Ram 2500 towing capacity guide has the figures.
Does the 6.7 Cummins High Output Use More Fuel?
There is no official Canadian figure to settle it. Ram Canada lists the 2026 Ram 2500's 6.7 Cummins High Output at 1,075 lb ft of torque, but publishes no fuel consumption figure for it or for the 6.4 HEMI, and Natural Resources Canada rates neither.
Output figures tell you how a truck pulls, not how many litres it burns. An older Ram 2500 with a different version of the 6.7 Cummins falls under the same testing rule, so the two fill up log is still the way to get your number.
Winter: Idling, the Block Heater and Cold Diesel
Natural Resources Canada puts it plainly: "the colder it gets, the more fuel your vehicle uses." It also says that "fuel consumption can increase 7 to 35% because of poor winter road conditions alone." Your January log will not match your July log, and that is not a fault in the truck.
Idling. Natural Resources Canada says "idling for more than 30 seconds has no benefit for the vehicle" and that "ten minutes of idling burns 0.25 to 0.50 litres of fuel," depending on the vehicle and conditions. A winter of long warm ups shows up in your log. For a diesel, the cold weather pages of the owner's manual for your model year are the authority on warm up, and our post on whether to warm up a diesel engine in the cold goes through it.
The block heater. Natural Resources Canada says "block heaters warm your engine in advance, which reduces fuel consumption and emissions," and recommends putting it on a timer "set to turn on no more than 2 hours before you start the engine." Use yours on a timer like that, and the way your vehicle's manufacturer directs. Ram Canada's 2026 Ram 2500 trim cards list a regular duty block heater on the configurations they show, and the window sticker confirms it on a given truck. Our service department installs block heaters, and our block heater guide for Manitoba covers the rest.
Cold diesel fuel. Our post on diesel fuel gelling in Manitoba covers what deep cold does to the fuel itself.
The winter front. A winter front is the cover that fits over a Cummins grille in cold weather. Fit and use one only as the cold weather pages of your owner's manual direct. Cummins winter fronts can be ordered through our parts department.
FAQs
What is the fuel economy of a Ram 2500?
There is no official Canadian fuel economy rating for a Ram 2500. Natural Resources Canada says manufacturers are not required to submit fuel consumption data for pickup trucks with a GVWR of more than 3,856 kg and an interior bed length of 183 cm or more, so those trucks are not tested, and its 2026 ratings file lists no Ram 2500. Measure your own over two fill ups: divide the litres by the kilometres and multiply by 100.
How big is the Ram 2500 fuel tank?
Ram Canada's 2026 Ram 2500 trim cards show a 121.1 litre tank on the two door models and a 117.3 litre tank on the Crew Cab models they describe, with the 6.4 HEMI. The window sticker shows the tank on a particular truck.
How far can a Ram 2500 go on a tank?
Ram Canada does not publish a range figure for the Ram 2500. Work out your own by dividing the tank size in litres by your measured L/100 km and multiplying by 100, then leave a reserve for rural Manitoba stretches between fuel stops. Ask our service team what owners report.
Does the 6.7 Cummins High Output use more fuel than the 6.4 HEMI?
There is no official Canadian figure to compare them. Ram Canada publishes no fuel consumption figure for the 2026 Ram 2500 with the 6.7 Cummins High Output or the 6.4 HEMI, and Natural Resources Canada does not rate either. A two fill up log on the truck you drive is the comparison that counts.
Does a block heater help fuel economy in winter?
Yes. Natural Resources Canada says block heaters warm your engine in advance, which reduces fuel consumption and emissions. It recommends a timer set to turn on no more than 2 hours before you start the engine; use yours the way your vehicle's manufacturer directs. Our service department installs block heaters.
The Bottom Line
The Ram 2500 has no Canadian fuel economy rating, for the 6.4 HEMI or the 6.7 Cummins High Output, because manufacturers are not required to submit fuel consumption data for pickups of its weight and bed length. What you can know is Ram Canada's engine and tank figures and what your own truck burns over two fill ups, empty and loaded. Bring that log when you visit Dunn Ram Trucks in Portage la Prairie, so the engine conversation starts from your own numbers. Compare builds in our new Ram 2500 inventory, get a trade-in value from our instant cash offer tool, and apply for financing online, with any approval on approved credit.
Tyler Dunn, Dunn Ram Trucks, Portage la Prairie
