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Message: [QUOTE="offroad toad, post: 482212, member: 24382"] The ford diesel is VERY sensitive to rpm in regard to fuel economy. You have the advantage of a smaller and better aftermarket turbo (the stocker is too big...silly ford guys :confused: ). The milage sweet spot is 1800 rpm to about 2100 rpm on a stock engine it is usally wider with an aftermarket turbo. Above 2100 rpm milage will drop off quickly. To be honest 16.5 m.p.g. is very good and it not going to get much better. In cold weather mobil 1 gear oil will also help milage, as I recall your unit did not have sythetic oil in from the factory. Any Ford truck that had an axel filled with sythetic oil will say so on the axel tags held in place by the bolts that hold on the diff cover. Be advised there are oils out there (castrol syntec) that claim to be sythetic and are not :eek: , mobil 1 is the real thing and so is amsoil. Is you F350 a dual rear wheel or a single. The dual is a dana 60 axel and the single is a visteon. The axels on these trucks do overheat when towing and the input shaft seals start to leak once they have been overheated, axel failure rates on these trucks that tow are very high. For the dana axel (drw) get the Ford diff cover from a F450 and put it on it is by far the best cooling cover out there. For the F250 and F350 srw guys (Visteon axel) get an Ultraduty.com diff cover, it is the same as the f450 cover made to fit the Visteon axel. [/QUOTE]