You should check coolant temp if it's close to ambient after a night in a garage. Maybe temp sensor is telling ECU that engine is hot. Or maybe you have wideband O2 sensor like Occasionally6 says.
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Quote:
Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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