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You are driving too short of distance to get an acurate reading not mention that you are still breaking it in. I would recommend you reset the reading on the radio information center and start over and include some hwy in it, I have the same body style 2004 LS, got it with 63 miles on the ticker, 94102 miles later I easily get at least 24 city and as much as 33.1 Hwy. As far as the A/C question I have noticed about 1 mpg lossed with it on HWY. Not sure about city as I mostly do HWY.
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