The 2013 Ford Taurus is by no means exceptionally fuel-efficient; but it isn't bad for a large sedan, either. Taurus SE, SEL, and Limited models with front-wheel drive earn an EPA fuel economy rating of 19 mpg city, 29 highway, although all-wheel drive versions are significantly low, at 18/26. The high-performance SHO, at 17/25, isn't much worse.
The Taurus SHO that we drove very enthusiastically over more than a hundred miles averaged 16.5mpg for that distance (it's rated 17 mpg city, 25 highway), while the Taurus Limited AWD we piloted later had been averaging nearly 20 mpg over an entire day and more than 250 miles of driving.
Unfortunately, the greenest model in the lineup--SE, SEL, and Limited models with the 2.0T engine, won't arrive until later in the model year; but Ford has promised at least 31 mpg highway.
A more economical turbo four-cylinder is on the way for the Taurus later in the model year; other models are about par for a large sedan.