What is the best Ford Transit Custom engine for high mileage driving?

I have a job that requires me to drive constantly, and I am considering purchasing a Ford Transit Custom. However, I am not sure which engine option is ideal for high mileage driving. Any recommendations?

I've been driving a Ford Transit Custom with the 2.2L engine for over 200,000 miles and haven't had any major issues. It's reliable and fuel efficient.

I would suggest getting the 2.0L EcoBlue diesel engine. It has better fuel economy and lower emissions, perfect for high mileage driving.

I've had experience with the 3.2L TDCi engine and it has great performance for long distance driving. It may not be as efficient as the others, but it's worth considering.