You people put too much faith in that sticker on the window when you buy the car. Your mileage will vary GREATLY with your driving conditions. 41mpg with a 3400? It's possible (maybe...) if you're doing mainly freeway driving at ~60-70mph, and the reduced-backpressure exhaust system will actually help mileage. If you're driving in the city, and always in a hurry, then your mileage will plummet to half of that, no matter what engine is in your car...
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