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Nissan Sentra 2001: to much fuel is required
Does anybody know how to solve the problem:
My Nissan Sentra GXE, 2001, required too much fuel, so I have to fill a tank each 210-220 miles (i.e 20-21 mpg instead of 26-27 at city and 22-23 mpg instead of 32-33 on highway). I was asking dealership to fix this problem 3 times:
1. I got an answer that all has been fixed (quite true, became 23-24 mpg at city). But two months ago all came back, 20-21 mpg
2. They said that nothing wrong with my car (Do you believe?! I don't...)
3. They asked the detailed 2 months log how much fuel have I filled and how many miles I drove.
Do you know how to solve this problem?