Yaris MPG Drop - Toyota Yaris Forums

xdarkxfirex · 11-05-2017, 02:35 PM

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.

ex-x-fire · 11-05-2017, 03:26 PM

Dirty maf or engine running cooler (bad t stat).

dogsridewith · 11-05-2017, 05:13 PM

Colder weather drops tire pressure (gas law) and stiffens tire rubber. Also thickens lubricants and delays warm-up.

Kaotic Lazagna · 11-05-2017, 05:30 PM

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.

Bluevitz-rs · 11-06-2017, 09:55 AM

Yeah, mine has dropped too. My bet is on winter gas already.

11-05-2017, 02:35 PM	#1
xdarkxfirex Drives: 2015 yaris le Join Date: Feb 2015 Location: hamilton, on Posts: 149	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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11-05-2017, 03:26 PM	#2
ex-x-fire Drives: 2010 yaris 3 door hatch Join Date: Jun 2013 Location: Sheboygan Falls, Wi. Posts: 543	Dirty maf or engine running cooler (bad t stat).

11-05-2017, 05:13 PM	#3
dogsridewith Drives: 2007 2-door hatchback Join Date: Jul 2016 Location: USAnotCA Posts: 750	Colder weather drops tire pressure (gas law) and stiffens tire rubber. Also thickens lubricants and delays warm-up.

11-05-2017, 05:30 PM	#4
Kaotic Lazagna View User's Garage Drives: '14 GT86, '08 Vitz Join Date: Dec 2006 Location: Central Valley, CA Posts: 9,873	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.

11-06-2017, 09:55 AM	#5
Bluevitz-rs 1NZ-6spd View User's Garage Drives: '05 6-Spd Vitz RS Join Date: Oct 2008 Location: Oshawa, Ontario, Canada Posts: 2,967	Yeah, mine has dropped too. My bet is on winter gas already.