The rear-wheel-drive F-150 is EPA-rated at 18 miles per gallon in city driving, 25 on the highway, and 21 combined, which are all 1 mpg better than the 2016 model with the EcoBoost V6 and six-speed.
The four-wheel-drive variant nets 17 mpg city and 23 highway, each up 1 mpg. The combined rating rises 2 mpg to 20.
Ford upgraded the F-150 powertrain menu for 2017 with a new 3.5-liter engine, which makes 375 horsepower and 470 pound-feet of torque. That's 10 more horsepower and 50 more lb-ft of torque compared with the widely used first-gen EcoBoost V6. The same basic engine and transmission will be used in the upcoming second-generation F-150 Raptor, where it will make 450 hp and 510 lb-ft of torque; fuel-economy ratings for that version have not yet been announced.
The 10-speed transmission, developed in partnership with General Motors, is an option on the EcoBoost 3.5-liter engine and across the F-150 portfolio, and it will be standard on the Raptor. Ford has not announced full EPA fuel-economy numbers for all variants using the 10-speed transmission.