for the 2011 model year. Along with the new V8 engine, the F-150 gained a new 3.7 L base V6 engine, and a powerful twin-turbocharged 3.5 L V6, dubbed EcoBoost by Ford. An automatic transmission became the only version. Other modifications include the addition of a Nexteer Automotive electric power steering system on most models. A recent study conducted by iSeeCars.com and published on the Ford Motor Company website listed the Ford F-250 Super Duty as the longest-lasting vehicle and Expedition, Explorer, and F-150 among the top-20 longest-lasting vehicles. Thirteenth generation (2015–2020) The 13th-generation Ford F-Series was introduced for the 2015 model year. Largely previewed by the Ford Atlas concept vehicle at the 2013 Detroit Auto Show, the new design marked several extensive changes to the F-Series design. In the interest of fuel economy, Ford designers reduced curb weight of the F-150 by nearly 750 pounds, without physically altering its exterior footprint. To allow for such a massive weight reduction, nearly every body panel was switched from steel to aluminum (with the exception of the firewall); the frame itself remains high-strength steel. To prove the durability of the aluminum-intensive design, during the development of the 13th-generation F-Series, Ford entered camouflaged prototypes into the Baja 1000 endurance race (where the vehicles finished). The 2015 F-150 was the first pickup truck with adaptive cruise control, which uses radar sensors on the front of the vehicle to maintain a set following distance from the vehicle ahead of it, decreasing speed if necessary. The 3.7 L V6 was dropped, replaced by a 3.5 L V6 as the standard engine, with a 2.7 L EcoBoost V6 added alongside the 3.5 L EcoBoost V6. While the 6.2 L V8 was withdrawn, the 5.0 L V8 continued as an option, with a six-speed automatic as the sole transmission. For the 2017 model year, the 3.5L EcoBoost 2nd gen was debuted along with the new 10-speed 10R80 transmission. The 2.7 L EcoBoost and 5.0L Coyote remained the same and both continued to be mated with the 6-speed 6R80 transmission. For the 2018 model year, the Ford F-150 underwent a midcycle redesign, being revealed at the 2017 New York International Auto Show. Following the introduction of the 2017 Super Duty model line, the F-Series (F-150 through F-550 and Ford Raptor) are again manufactured using a common cab (for the first time since 1996). For 2018, the F-150 shifted from