2010 335d bad mileage

mardi 5 août 2014

I noticed that i am getting less than 400 miles to the tank. After filling until the auto-shut off, I get about 350 miles before the fuel light comes on.

I drive about 8 miles to work and 8 miles back in stop and go traffic everyday. Some of it is at 50+ mph on the expressway.



The computer says I am getting about 20 mpg.



I'm worried I may have carbon build up.

I bought the car in 8/2013 and my mpg has steadily been dropping. I may be imagining it, but I feel like I've lost power as well.



Thoughts? Should I do preventative maintenance? Or just drive it until something goes wrong? I plan on keeping the car forever.

I have the Gold extended warranty until 2017/100k.

Mileage: 51k




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