Earlier this year, Ford announced plans to introduce a diesel version of the redesigned F-150. The Blue Oval promised that the new 3.0-liter V-6 turbodiesel would make 250 hp and 440 lb-ft of torque, and that towing and fuel economy ratings would both be best-in-class. Official figures weren't available at the time, but the new engine was supposed to be even more efficient than the full-size pickup mpg champ, the Ram 1500 EcoDiesel. Now the numbers are in, and Ford's done a lot more than simply edge out Ram.

The Environmental Protection Agency officially rates the F-150 Power Stroke Diesel at 22/30 mpg city/highway, giving it a combined rating of 25 mpg. That puts it ahead of the Ram 1500 EcoDiesel's 20/27/23 mpg rating and makes it the first full-size truck to earn a highway rating of 30 mpg. The diesel Chevrolet Colorado and GMC Canyon posted even higher numbers back in 2015, but they're a size smaller than the F-150.

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"Even a few years ago, customers wouldn't have imagined an EPA-estimated rating of 30 mpg highway would be possible in a full-size pickup, but our team of crazy-smart engineers rose to the challenge," said Hau Thai-Tang, Ford's head of product development, in a statement.

The diesel engine will be available on Lariat, King Ranch, and Platinum-trimmed SuperCrews, as well as the Lariat SuperCab. It will be a $4,000 option on Lariat models, but it can be added to King Ranch and Platinum models for only $3,000. Orders are currently open, with deliveries beginning next month.