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Old 06-11-2012, 09:41 AM   #978
kam327's Avatar
Join Date: Feb 2012
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Location: Tampa, FL
What I Drive: '17 Mazda6 (traded in the Focus)

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Anybody have some REAL numbers for effect on mileage due to A/C use?

I noticed my last tank dropped about 2 mpg to around 31.5 for no apparent reason, and this tank looks to be even worse (computer currently reading about 30.5). This is after getting 33-34 over several tanks on my commute. The most likely culprit is increased A/C use - I used to use it only in the afternoon but started carpooling recently and I'm using A/C in the morning now too for the benefit of my passenger. But a 2-3mpg hit was much more than I was expecting.

The other main possibility is bad gas - I'll be switching stations next fill up to see if there's any effect.
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