Aftermarket Sparkplugs - Toyota Yaris Forums

jkuchta · 09-24-2007, 04:07 AM

Has anyone here changed out the stock plugs for aftermarket plugs? Marketing hype being what it is, I'm not sure $10/per is worth any MPG or HP gain. I know the stock plugs are good, and I only have a little more than 18k miles on the car, but a few mpgs would be worth the expense if there was a desent return.

As a note, I'm looking more for MPG than HP...lets not kid ourselves here, I drive the car to work, and bought it based on price, durability, and economy.

Note, since new I've averaged 37-38 mpg, 50/50 hwy./city driving in Southern California, using Shell V-Power and Castrol full synthetic, changed at about 3k intervals. Also, I've installed a K&N filter in the stock housing.

Thanks in advance.

xpeteyjtx · 09-24-2007, 08:02 AM

I don't think you will see a noticeable gain. You already have Densos or maybe NGKs from the factory which are a perfect match for your car from a design standpoint. You will see more MPG by adjusting your driving habits.

PetersRedYaris · 09-24-2007, 04:10 PM

The stock spark plugs are iridium and basically as good as you can get. They are rated for 100,000 miles so don't even worry about them.

caveatipse · 09-25-2007, 01:44 AM

The stock Yaris plugs are actually very good.

Ferret_san · 09-25-2007, 07:40 AM

I've never noticed any difference in my cars by changing the sparkies, but in the past, I've noticed a significant improvement in responsiveness when changing the leads.

09-24-2007, 04:07 AM	#1
jkuchta View User's Garage Drives: 2007 Yaris hatch (red) Join Date: Sep 2007 Location: L.A. Posts: 557	Aftermarket Sparkplugs Has anyone here changed out the stock plugs for aftermarket plugs? Marketing hype being what it is, I'm not sure $10/per is worth any MPG or HP gain. I know the stock plugs are good, and I only have a little more than 18k miles on the car, but a few mpgs would be worth the expense if there was a desent return. As a note, I'm looking more for MPG than HP...lets not kid ourselves here, I drive the car to work, and bought it based on price, durability, and economy. Note, since new I've averaged 37-38 mpg, 50/50 hwy./city driving in Southern California, using Shell V-Power and Castrol full synthetic, changed at about 3k intervals. Also, I've installed a K&N filter in the stock housing. Thanks in advance.

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09-24-2007, 08:02 AM	#2
xpeteyjtx Drives: 07 BB Yaris Join Date: Aug 2007 Location: Massachusetts Posts: 54	I don't think you will see a noticeable gain. You already have Densos or maybe NGKs from the factory which are a perfect match for your car from a design standpoint. You will see more MPG by adjusting your driving habits.

09-24-2007, 04:10 PM	#3
PetersRedYaris View User's Garage Drives: 2005 Scion xB Join Date: Nov 2006 Location: The Black Hills of South Dakota Posts: 1,059	The stock spark plugs are iridium and basically as good as you can get. They are rated for 100,000 miles so don't even worry about them.

09-25-2007, 01:44 AM	#4
caveatipse Banned Drives: 2007 Black Yaris Join Date: Aug 2007 Location: Louisiana Posts: 119	The stock Yaris plugs are actually very good.

09-25-2007, 07:40 AM	#5
Ferret_san Hack.... What hack ?? View User's Garage Drives: 07 YR Join Date: Aug 2007 Location: Australia - BrisVegas Posts: 285	I've never noticed any difference in my cars by changing the sparkies, but in the past, I've noticed a significant improvement in responsiveness when changing the leads.