What's the most fuel-efficient Ford Transit Custom for long distances?

I'm planning on using my Ford Transit Custom for long distance deliveries and I want to know which model has the best fuel efficiency. Any tips?

I would recommend the Ford Transit Custom with the EcoBoost engine. It's been tested to have the highest fuel efficiency for long distance driving.

If you want to save on fuel costs, I suggest looking into getting a diesel engine for your Ford Transit Custom. It's more expensive upfront, but it'll save you money in the long run.

I've been using the Ford Transit Custom with the 2.0-liter EcoBlue diesel engine and it's been great for long distance trips. I highly recommend it.