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Old 09-11-2015, 11:06 AM   #7 (permalink)
Daox's Avatar
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,180

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
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Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

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The best way to use A/C is put the temperature control on full cold. Then, turn your fan on the lowest speed setting to stay comfortable. However, the fuel economy hit can still be pretty drastic. Some reports say up to 30%. I find it much lower in my experience, but I use it very minimally.

I probably wouldn't bother with the roof rack if you can't remove it easily. Instead, do a grill block, air dam or both. The gains will probably be greater anyways, and easier to do.
Current project: A better alternator delete
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