Question: what is the most fuel efficient jeep wrangler?
Answer: 2020 Jeep Wrangler EcoDiesel Is Officially the Most Fuel-Efficient Wrangler. Jeep's 3.0-liter EcoDiesel V-6 engine adds weight and expense to the Wrangler — it's 400 pounds and $4,000 more — but our time behind the wheel has been largely positive.