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I'm currently at 4500 and haven't really noticed any changes since I first got it... it may be a little smoother but I doubt it's an actual difference. Love the car though
My mileage got better. My first few tanks averaged about 19 mpg, but by 2000 miles on the OD, I've been averaging 23.5 mpg. I'm driving the same; I think it must be due to engine break-in.