The front-wheel drive version of the 2015 Acura RDX achieves 20 mpg city, 28 mpg highway and 23 mpg combined, while the all-wheel drive model is estimated at 19 mpg city, 27 mpg highway, and 22 mpg combined. That's about on par with other luxury crossovers--although not quite as good as the BMW X3 with its turbo four, for instance.
And that underscores what will be one of the issues for some shoppers. The Acura RDX only comes with one engine: a 3.5-liter V-6. That doesn't sound like the recipe for segment-leading fuel economy, and it isn't. But it isn't bad either, for its typical family purpose, and how it might be bought in place of even bigger and heavier vehicles.
There are still no plans for a hybrid model in the RDX; and the diesel engine that Acura had been teasing a few years ago is no longer in the works.