Why do I get better milage with AC on?

Tiny
ROBERTBRENDA
  • 2004 CHEVROLET ASTRO
  • 22,800 MILES

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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Saturday, May 26th, 2012 AT 1:36 AM

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Tiny
MHPAUTOS
  • EXPERT
  • 31,024 POSTS

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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Saturday, May 26th, 2012 AT 1:41 AM
Tiny
ASEMASTER6371
  • EXPERT
  • 25,517 POSTS

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

Roy

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Saturday, May 26th, 2012 AT 1:45 AM

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