The spacious Expedition has continued to improve since a 1999-model-year configuration carried a highway rating of just 15 mpg.

Ford has claimed best-in-class fuel economy for the 2018 Expedition.The 4x2 package boasts city/highway/combined ratings of 17/24/20 mpg, equating to a maximum range of 538 miles, thanks to a new 10-speed automatic transmission and 3.5-liter EcoBoost V6 engine.

"The Expedition 4x2 is the only full-size SUV to achieve 20 miles per gallon combined, besting the Chevrolet Suburban (19 mpg), Chevrolet Tahoe (17), Nissan Armada (16) and the Toyota Sequoia (15)," the company proudly notes.

The 4x4 edition isn't too far below, achieving 17/22/19 mpg ratings despite the additional drivetrain friction.

The 2018 benchmarks are particularly impressive when compared to the first-generation Expedition, which landed 11/15/12 mpg when equipped with a 5.4-liter V8.