Fuel economy estimates for the Ram 1500 EcoDiesel stand at 26 mpg combined (22 city/32 highway) for the two-wheel-drive model and 24 mpg combined (21 city/29 highway) when equipped with four-wheel drive. These numbers surpass the previous EcoDiesel ratings by 2-3 mpg in most areas, though the rear-drive highway rating increases by a whopping 5 mpg. At a glance, the new rear-drive Ram 1500 is about as efficient as the F-150, but both are slightly thirstier than the Silverado 1500. Four-wheel-drive Rams best the Ford by a few mpg all around but are marginally less efficient than the Chevrolet.
Despite consuming a little more fuel than the Silverado's diesel, the Ram 1500 might be a better overall pick. For one, it tows more than the Chevrolet (maximum towing capacity of 9,300 pounds) or the Ford (11,500 pounds). Another benefit is the Ram's optional 33-gallon fuel tank, which gives it a maximum estimated range of over 1,000 miles. For comparison, both the F-150's and the Silverado's tank sizes vary between 23-26 gallons depending on cab configuration. (The Ford offers a 36-gallon tank, but you can't get it with the diesel.) It's also significantly less expensive than its competitors.
While detailed pricing information has not yet been released, you'll generally pay $4,995 more for the EcoDiesel than you would for the base gasoline V6 engine. A two-wheel-drive Tradesman Quad cab with EcoDiesel power costs $38,585 with destination charges included, and that's the lowest diesel cost of entry in the segment by a wide margin.
The Ford F-150 is available with a 3.0-liter Power Stroke turbodiesel V6 engine that's backed by a 10-speed automatic transmission. But its ratings of 250 hp and 440 lb-ft of torque are less impressive than the Ram's. Rated fuel economy in mixed driving is 25 mpg combined (22 city/30 highway) for two-wheel-drive models and 22 mpg combined (20 city/25 highway) for four-wheel-drive versions.
In the F-150, the diesel engine costs $4,000 in a Lariat that comes standard with a 2.7-liter EcoBoost V6 and $3,000 in a King Ranch that comes standard with a 5.0-liter V8. Ford does not offer the diesel engine in its low-priced XL model aimed at the work-truck end of the market unless you are a fleet buyer. The least expensive Power Stroke F-150 XLT we were able to configure cost upward of $46,000 because a luxury trim package is a prerequisite.
General Motors will soon offer a 3.0-liter Duramax diesel in the Chevrolet Silverado 1500 and GMC Sierra 1500 trucks, and it will arrive in showrooms at nearly the same time as the Ram. The Duramax differs in that it is a straight-six engine instead of a V6, but it remains to be seen if this will be an advantage. It has a higher power rating of 277 hp, but its torque rating of 460 lb-ft is a bit lower. Like the Ford, it comes with a 10-speed transmission. But its fuel economy ratings are significantly better than Ford's: 27 mpg combined (23 city/33 highway) with two-wheel drive and 25 mpg combined (23 city/29 highway) with four-wheel drive.
Chevrolet does not offer this engine in the low-priced Work Truck or Custom trim. Nor does it offer it in the Trail Boss off-road version that competes head-on with the Rebel. And the engine's true pricing is foggier because in the case of the LT and the RST you must also spend money on prerequisite options to get one. The least expensive Silverado 1500 diesel we were able to configure was an LT that cost just over $45,000.