Hi guys
I have a GU 4.2td that we use for pulling a Caravan which is 2 ton plus, the best i can get from the fuel consumption at the moment is 17.5 ltrs to 100kms, i need to improve this as we intend to travel round Oz next year i intend to fit a 3inch exhaust and turbo booster but will this help the fuel consuption the engine is in good condition burns no oil between services and does not blow out any smoke, i have looked into gas injecttion but was told it would not nececcarily improve fuel consumption would appreciate any help

Neil