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Originally posted by P.E.Haiges:
Aaron: I get only 23 MPG not the 28 I should get and that you get on your 300SD. What can I do to increase the milage on my 300SD? It has 180K miles but runs just about perfect except for the excess fuel consumption.

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There aren't a lot of cheap repairs here. Injectors can be improved with additives but a new set will buy a lot of fuel.

One area thats cheap is the boost signal and of course boost itself. You should measure the boost after the overboost protection switch-over valve. Measure it between the valve and the injection pump. It should max at about 10psi. If you don't get good power you won't get good mileage.


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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician