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Sorry to say but this is not an econo car. It will average around 24mpg (city/hwy). Best you can do is keep up on the regular maintenance (tire inflation, oil&lube, air filter, plugs and don't carry a bunch of junk around in the car. Reducing weight helps. Above all though is easy on the gas peddle! I have a 2010 manual impreza and I am averaging 30.6mpg but I drive mostly highway and take it eay on acceleration. Good Luck.
It's possible it may not even be the brake. Check the link between the front sway bar and body of the car. They are made with plastic cups that the ball section sits in and can easily brake causing a clunking or rattle sound. You may need to remove the link from the car to check it. Even if this is not the problem you may want to consider upgrading them with an after market kit. I would also add a rear sway bar. The car will handle much better (use aftermarket, the dealer will rip you off and it's an easy job). Good luck. I hope this helps.
I have a 2010 Subaru Impreza 2.5i premium 5 door, 5 speed with 8k mls on it. The car runs well and does not have any check engine lights on but there is a slight intermittent knock when switching gears and staring off in first. I was told by my Subaru service manager that the car only needs 87 octane and that I can experience occasional knock and that it is normal. I have been driving manuals for 25 years (both foreign and domestic) and never had this happen. Is this an issue I should push with the dealer and will it eventually destroy my engine? I was hoping to get at least 200k mls out of this car.