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Sudden drop in gas mileage S90-V90

I agree about vacuum leaks-you may want to carefully spray carb cleaner while the engine is running-a jump in idle speed means you've sprayed near a leak.I have to check that vacuum tree poolman is always preaching about.I like the original tri-elecrode plugs-a full set only cost me about $30 at the dealer.My mileage at 100K+ is still about 20 mpg local,25-27 highway.Premium helps-and prevents chronic pinging and improves performance in these cars.
sredwine V90 has 104K,940T has 167K






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