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I'm wondering if there is some attribute in the Aveo that makes it suffer more an MPG decrease than the average car. I haven't had it very long and have never seen what it does with non-oxygenated fuel. Even my SGII was thrown off by the change. Since I got it dialed in, it was pretty correct about how much gas the car needed at fuel up time. Usually, I put in a tad more fuel than it expects and have to correct the SG upward a tiny bit.
This time, I put in slightly more than a gallon LESS fuel than the SG expected and had to correct it downward. I've never had to correct the SG this much.
We'll see if the MPG holds or not. Maybe it's just a fluke.
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