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I would suspect AC mostly too. In my wife's Subaru when we run her AC I put it on internal air recirculation and only run the AC (at or near max fan) when it is FE favorable, such as deceleration fuel cut off or downhill light cruise. When the AC is off the compressed refrigerant keeps cooling air for a bit. So in high load situations I turn AC off, keep internal air fan on, and it keeps blowing cool air for a little. Then when it is more advantageous, I click the AC back on. My wife and I both do this quite automatically now. Second nature. But there are times when my daughter or Wendy or both of them and maybe even me just wanna run the AC and so we do...
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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