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ALL fuel related components, o2 sensors, ET sensor, spark plugs, cleanliness of air filter, boost leaks, etc. Also, if you drive the car hard, and do lots of stop-and-go your mileage will be poor, but 170 miles per full tank is piss poor. I can usually drive 170 miles on 1/2 tank, but then again I don't have nearly the mods you do, I'm pretty much stock.
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