How to increase fuel efficiency in a Ford Transit Custom van?

I recently purchased a second-hand Ford Transit Custom van and I've noticed it's not getting as many miles per gallon as it used to. Is there anything I can do to improve its fuel efficiency?

One simple way to increase fuel efficiency in a Ford Transit Custom is to ensure you're regularly maintaining it. This includes changing the oil filter, air filter, and spark plugs according to the manufacturer's recommendations.

Another option is to try using a fuel additive. These can help clean the engine and improve fuel combustion, resulting in better mileage.

You can also try adjusting your driving habits. Avoid hard braking and acceleration, as well as idling for extended periods of time.