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Some time ago my car had a noticeable decrease in mileage. Normally runs at around 35 MPG on highway and all of the sudden it ran 29 MPG. I had a hunch it could be that the engine is running cold so I checked the hidden menus and there it was. Engine temperature max. 65-67 °C. I happened to order the main thermostat before I even learned that it could also be the EGR thermo. Luckily it was causing the problem and changing the main thermostat did the trick. No problems since.
EGR deleted and DPF deleted now. As said earlier it will only have a minor effect on coolant temperature and my mileage has gone down ever so slightly, to about 33 MPG. But having that useless junk out of my car is way worth it after all the problems I had with it.
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