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Old 08-31-2018, 11:39 AM   #10 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,938

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,223
Thanked 1,925 Times in 1,311 Posts
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...
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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