I had a car that leaked fuel but I think it only cost around $1.09 at the time so I lived with it. At $3+ per gallon it would pay to fix that leak. 9 mpg is not possible imho with a 3 series. It is with a SUV, but even 328i loaners get 15-16 in the city. 335i's should be 19 in the city.
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