Jeep Wrangler Diesel already testing, before 2019 launch
The iconic Jeep Wrangler is a tough vehicle to make fuel-efficient. Its separate frame and body add weight, and it has all the wind-cheating grace of a small municipal hospital. The Wrangler SUV only gets redesigned every 10 years or so, so each new generation is a big deal to Jeep fans. DON'T MISS: Turbo-4 to boost fuel economy in next Jeep...