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Dirty oil at 3000 mi, mpg decreasing by 5 mpg I have a 2014 Passat TDI nav, DRG, and I've noticed my mpg has decreased by about 5 mpg in the last 1000 miles. The oil is black at 3000 miles. First scheduled oil change is 10,000 mi. Can I expect better mpg if I changed oil at 5,000 mi ? Driving...

I have a 2014 Passat TDI SE with nav. It has 1260 miles. I've noticed the average fuel consumption display showing 41-47 mpg with 3 fill-ups for my type of driving. After the last fill up yesterday I noticed that it has dropped to 33-37 mpg range. Is it possible to get a bad batch of diesel...