hotter thermostat for more mpg - Toyota Yaris Forums

ex-x-fire · 10-05-2014, 07:54 PM

Has anyone installed a hotter thermostat for increased mpg? I had a scanner on my 2010 yaris for the 1st time, I noticed the temp never got hotter then 185. It make sense b/c it has a 184 stat in it & it was cool out that day (low 50s).
I've had some experience on GMs with hotter t stats & improved mpg. It usually adds a couple highway mpgs esp. on colder days. The TDI guys have had great luck with them.

bronsin · 10-06-2014, 05:52 AM

I tried a block heater and it didnt improve mpg enough to make it worth the $$ and trouble.

I doubt very much you would notice the increased mpg (if any) from a hotter thermostat. And I can think of problems like over heating the engine in stop and go traffic in summer or burning out the fan sooner or something similiar.

ex-x-fire · 10-06-2014, 07:17 AM

Why wouldn't I see an improvement? Esp. if the engine is running right at the t stats rating, the fan shouldn't kick on till 205. The coolant temp sensor that tells the computer the temp has a huge impact on fueling the engine.
I had a gm truck that I ran a 180, 195, & 205 stats. I lost mileage with the 180 (-2-3mpg) & gained some with the 205 stat over the stock 195.

woops · 10-06-2014, 07:33 AM

If you live in a cold area that makes sense otherwise just kill this thought of yours :p

bronsin · 10-06-2014, 02:08 PM

Quote:

Originally Posted by ex-x-fire

Why wouldn't I see an improvement? Esp. if the engine is running right at the t stats rating, the fan shouldn't kick on till 205. The coolant temp sensor that tells the computer the temp has a huge impact on fueling the engine.
I had a gm truck that I ran a 180, 195, & 205 stats. I lost mileage with the 180 (-2-3mpg) & gained some with the 205 stat over the stock 195.

I guess I really dont know if it would make much of a difference. My gut just tells me it wouldnt and that it could cause problems you would rather not have.

But I might be wrong.

Try it and see. You can always go back to regular.

WeeYari · 10-06-2014, 02:41 PM

You've touted personal and known experiences with other manufacturers. T-stats are cheap enough to experiment. Do it, be the first here and blaze a trail.

ex-x-fire · 10-06-2014, 07:53 PM

Yeah, I've been looking at different ones. The yaris takes one with a 56 mm base, I'm having trouble finding a hotter rated one. I might have to combine 2 to make one.

why? · 10-07-2014, 07:29 PM

Or you could block off some of the front vents and get the same effect with a little better aerodynamics to boot.

10-05-2014, 07:54 PM	#1
ex-x-fire Drives: 2010 yaris 3 door hatch Join Date: Jun 2013 Location: Sheboygan Falls, Wi. Posts: 506	hotter thermostat for more mpg Has anyone installed a hotter thermostat for increased mpg? I had a scanner on my 2010 yaris for the 1st time, I noticed the temp never got hotter then 185. It make sense b/c it has a 184 stat in it & it was cool out that day (low 50s). I've had some experience on GMs with hotter t stats & improved mpg. It usually adds a couple highway mpgs esp. on colder days. The TDI guys have had great luck with them.

10-06-2014, 05:52 AM	#2
bronsin Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008 Location: nj Posts: 4,790	I tried a block heater and it didnt improve mpg enough to make it worth the $$ and trouble. I doubt very much you would notice the increased mpg (if any) from a hotter thermostat. And I can think of problems like over heating the engine in stop and go traffic in summer or burning out the fan sooner or something similiar. __________________ Synthetic Oil: Its All In Your Head

10-06-2014, 02:41 PM	#6
WeeYari View User's Garage Drives: 06 Polar White 5dr, 13 Soul 4u Join Date: Oct 2008 Location: Georgetown, Ontario, Canada Posts: 5,740	You've touted personal and known experiences with other manufacturers. T-stats are cheap enough to experiment. Do it, be the first here and blaze a trail. __________________

10-07-2014, 07:29 PM	#8
why? Only Happy When it Rains View User's Garage Drives: Yaris LB Join Date: Jan 2006 Location: harnett county NC Posts: 4,097	Or you could block off some of the front vents and get the same effect with a little better aerodynamics to boot. __________________ Colin Chapman disciple

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10-06-2014, 07:17 AM	#3
ex-x-fire Drives: 2010 yaris 3 door hatch Join Date: Jun 2013 Location: Sheboygan Falls, Wi. Posts: 506	Why wouldn't I see an improvement? Esp. if the engine is running right at the t stats rating, the fan shouldn't kick on till 205. The coolant temp sensor that tells the computer the temp has a huge impact on fueling the engine. I had a gm truck that I ran a 180, 195, & 205 stats. I lost mileage with the 180 (-2-3mpg) & gained some with the 205 stat over the stock 195.

10-06-2014, 07:33 AM	#4
woops Drives: Jeep Cherokee XJ 1996 Join Date: Jul 2009 Location: Lahore, Pakistan. Posts: 38	If you live in a cold area that makes sense otherwise just kill this thought of yours :p

10-06-2014, 07:53 PM	#7
ex-x-fire Drives: 2010 yaris 3 door hatch Join Date: Jun 2013 Location: Sheboygan Falls, Wi. Posts: 506	Yeah, I've been looking at different ones. The yaris takes one with a 56 mm base, I'm having trouble finding a hotter rated one. I might have to combine 2 to make one.