What is the most fuel-efficient Ford Transit Custom engine option?

I am in the market for a Ford Transit Custom and wondering which engine option offers the best fuel efficiency. I am looking to minimize my fuel costs in the long run.

Based on my experience with the Ford Transit Custom, the 2.0L EcoBlue diesel engine is the most fuel-efficient. It offers great mileage and is also very reliable.

I highly recommend the 1.0L EcoBoost engine as it is not only fuel-efficient but also offers great performance. It is perfect for city driving.