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My gas mileage went down to 325km ish per tank this past winter. Likely due to a bad o2 sensor, then took a while to improve again once that 02 sensor was replaced. My mileage is hurt anyhow, since I have fender spoilers, plus a wing. But now it's improved to 400ish km.
FWIW, most of my driving is city driving with only brief stints on the highway. Though I did get 600km on a tank a couple weekends ago when I drove up to the bruce peninsula.
Are you throwing any codes? Rough idle? Aero? etc?
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