Sometimes, the best information on pending model launches comes from the United States government and not from auto manufacturers. That seems to be the case with the next two Porsche 911 models to be released, which have appeared first on the EPA website and not in a Porsche press release.

Look for the 2013 Porsche 911 Carrera 4 and Carrera 4S to be the next new Porsche 911 variants coming stateside, in both coupe and cabriolet versions. As with the other new 911 models, Car and Driver says the all-wheel drive Carrera models will generally boast better fuel economy.

We say generally, since there are a few exceptions to the rule. The 2013 Carrera 4S cabriolet with an automatic transmission loses one mpg on the highway compared to the outgoing model, while the 4S coupe with the automatic retains the same 26 mpg on the highway as last year.

Carrera 4 models are powered by the same 3.4-liter flat-six engine found in the 2013 Porsche Carrera, good for 350 horsepower and 287 pound feet of torque. Carrera 4S models step up to the 3.8-liter flat-six engine found in the Carrera S, which puts out 400 horsepower and 325 pound-feet of torque.

Look for pricing to be published closer to the cars’ launch date, which we’d estimate as late summer.