Driven with a light right foot, the TRX returns 10 mpg in the city, 14 mpg on the highway, and 12 mpg combined. It's the least efficient Hellcat-powered model; Jeep's Grand Cherokee Trackhawk scores 13 mpg combined, while Dodge's Charger and Challenger post 15. Figures for the Durango haven't been published yet, but there's no reason to think it will use more gas than the TRX. At 12 combined, the truck is about on par with the Lamborghini Aventador S.
On the surface, that's not great. Keep in mind the mighty TRX was developed for off-road performance, however, and we doubt fuel economy entered the equation at all. It's a body-on-frame truck powered by a 6.2-liter V8 supercharged to 702 horsepower, it has mammoth 35-inch all-terrain tires to push around, and it weighs 6,350 pounds. Viewed in this light, 12 mpg is actually shockingly decent. Conversely, the folks who designed the Toyota Prius weren't concerned about its water fording ability, its approach angle, or its zero-to-60-mph time.
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