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I used 16 oz of TCW3 last fill up and got back from a trip last night. 36.5 mpg on a 360 mile trip. Since this is my first trip with the car I can't say if the TCW3 oil had anything to do with the mpg, which I am very happy with. When I filled up last night I used 12 oz of DieselKLeen and no TCW-3. After today's drive into work I think I can tell that the engine idles louder.
I think I will stop using the DK for now and just drop in 12 to 16 oz of TCW3 when I fill up. Maybe use the DK every so often to clean up the injectors. I'm not even sure if the DK is doing anything for my engine at all, to be truthful.
I picked up 1 gallon of SuperTech TCW3 at WM last night. It was $10.97.
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