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So your loud exhaust is doing the same job that a vacuum gauge or a scangauge would do, only the penalty for driving in a wasteful manner is that it gets really loud where as with a gauge to help you drive better you have to look at it from time to time.
I've pulled off getting 25mpg with my parents Ford Ranger pickup truck... while towing my commuti-car on a trailer! mostly because I couldn't drive over 50mph without it becoming unstable, so drive it slow and the mileage will jump up.
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