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Another theoretical question. Some time ago I put new muffler (instead of an old empty fart can) I did around 1800 miles recently and I got better MPG than before. Most of 1800 miles were made on highways, tire pressure was increased but I drove a bit faster than usual (arround 2800rpm) and the car had to carry much more weight than usual. Tire pressure and highways are obvious things which increased MPG but theoretically the exhaust fumes were slowed down a bit by new muffler so the O2 sensor reading was more accurate - ECU could better control the engine lean burn. Is it correct?
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