Hello, I want to buy a 2.8 L Sharan 2002 model, the problem is that uses allot of fuel. I need to find out if there is any way of setting the electronic fuel system/ injector system/ computer system / whatever system to be able to somehow use less fuel? I dont mind if I have less power, as I do deliveries and dont need much power anyway, I need fuel consumption. Is there anything one can do?

Thanks