We're left to guess at exactly what sort of powertrain the Wrangler plug-in will use, and our money is on a version of the Pacifica Hybrid's 260-horsepower V6 engine and motors. Since that system uses a version of the Pentastar V6 already used in the Wrangler, it should be relatively easy to package. The Pacifica Hybrid with its 16-kWh battery can drive up to 33 miles on a charge, but we expect the Wrangler will have a shorter electric range due to weight and substantially worse aerodynamics. That could be offset somewhat if Jeep uses a larger battery, but that could lead to packaging issues as well as additional cost. Regardless, overall mileage should be greatly improved compared with non-hybrid Wranglers.
Jeep said that the Wrangler plug-in will launch in 2020. It will likely cost a fair bit more than a basic Wrangler, considering the fact the base Pacifica Hybrid is about $13,000 more than a base non-hybrid version. Some of that is probably due to equipment differences, but the hybrid powertrain will still probably command a premium of a few grand.