The exhaust leak caused a bit of a mileage drop for me but mine was bad (as in, I couldn't use the HVAC everytime I stopped) but the mileage drop wasn't that drastic. It never hurts to fix it though. Just curious, did you get the car tuned for their higher octane gas? 93 here is 95 over there and I've seen it go as high as 100 over in Europe.
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