2004 Chevrolet Astro Repair Question
Why do i get better milage with ac on?
About the only thing that can affect this if the weather is very humid as well, the extra moisture and with the air being a little more denser can affect economy to a small degree but not to the extent you report, you may have noticed that on cool damp nights the car will run smoother and get a little better economy, same thing is going on.
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density of the air is critical map sensor and o2 sensors are very sensitive to atomspheric conditions.
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