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Old 11-05-2017, 02:35 PM   #1
Drives: 2015 yaris le
Join Date: Feb 2015
Location: hamilton, on
Posts: 128
Yaris MPG Drop

Anyone notice this. Yaris is about 9 years old, I replaced the original plugs on them about three years ago with NGK BKR5EIX11 Iridium IX with ones I got on sale from canadian tire. Since then, I have put around 70k on them. Pulled them out and they dont really look worn. Cleaned them off and reused them. Air filter is clean, and throttle body I cleaned probably 20-30k ago.

I also do the occasional fuel injector cleaner which I doubt has much effect anyways.
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Old 11-05-2017, 03:26 PM   #2
Drives: 2010 yaris 3 door hatch
Join Date: Jun 2013
Location: Sheboygan Falls, Wi.
Posts: 214
Dirty maf or engine running cooler (bad t stat).
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Old 11-05-2017, 05:13 PM   #3
Drives: 2007 2-door hatchback
Join Date: Jul 2016
Location: USAnotCA
Posts: 561
Colder weather drops tire pressure (gas law) and stiffens tire rubber. Also thickens lubricants and delays warm-up.
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Old 11-05-2017, 05:30 PM   #4
Kaotic Lazagna
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Drives: '14 GT86, '08 Vitz
Join Date: Dec 2006
Location: Central Valley, CA
Posts: 9,708
Your local gas stations may have also switched to a cold temp/season/winter blend, which always causes a drop in mpg. Check you tire pressure as well.
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Old 11-06-2017, 09:55 AM   #5
1NZ-6spd Turbo
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Drives: '05 6-Spd Vitz RS Turbo
Join Date: Oct 2008
Location: Courtice, Ontario, Canada
Posts: 2,947
Yeah, mine has dropped too. My bet is on winter gas already.
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