WHY DO I GET BETTER MILAGE WITH AC ON?

2004 Chevrolet Astro

Tiny

ROBERTBRENDA

May, 26, 2012 AT 1:36 AM

04 astro AWD 4.3 vortec csfi auto trans 228,000 miles. I drive about 200 miles a day (windows always up). I normally use about 13 gallond fuel a day. The weather got warm I started running the ac. I now use about 10 gallons a day ac on. Any idea what is going on?

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Tiny

mhpautos

May, 26, 2012 AT 1:41 AM

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.

Tiny

ASEMaster6371

May, 26, 2012 AT 1:45 AM

Density of the air is critical map sensor and o2 sensors are very sensitive to atomspheric conditions.

Roy

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