MPG and PSI what's yours? - Page 3 - Toyota Yaris Forums

Rigaud · 09-28-2015, 06:33 PM

Wow, such high tire pressure with no benefit at all from what I'm reading here.

- 205/45R16
- lowered 1.5", 1ZZ TB, 1ZZ intake manifold, header, 2-1/4" SS freeflow exhaust end to end, TRD sway bar.
- 26 psi rear, 30 psi front
- 65-70 mph = 35-37 mpg
- 50-55 mph = 41-43mpg

I just drive the car, nothing special!!

fourbangingfun · 09-28-2015, 06:46 PM

34 psi

41-43 mpg summer

34-38 mpg winter

Massachusetts

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soldout · 09-28-2015, 10:37 PM

Rigaud - you have modded your Yaris which might increase your MPG but the larger heavier tires subtract from your MPG.

My yaris is bone stock with the addition KNN filter and about 100lbs of stereo equipment.

Even if increase tire pressure only gave me .1MPG per tank increase Id still do it.

My Crosstrek hybrid has active grill shutters and aero wheels which are heavier then standard wheels. Doubt those 2 things combined even provide 1MPG increase but its still something the engineers are thinking of to squeeze every last .1 MPG

Rigaud · 09-29-2015, 07:00 AM

Quote:

Originally Posted by soldout

Rigaud - you have modded your Yaris which might increase your MPG but the larger heavier tires subtract from your MPG.

My yaris is bone stock with the addition KNN filter and about 100lbs of stereo equipment.

Even if increase tire pressure only gave me .1MPG per tank increase Id still do it.

My Crosstrek hybrid has active grill shutters and aero wheels which are heavier then standard wheels. Doubt those 2 things combined even provide 1MPG increase but its still something the engineers are thinking of to squeeze every last .1 MPG

I read all three pages of this blog and not one person here mentions why tire manufacturers rate their tires with a max tire pressure. Theirs also a rating for maximum load on every tire which coincides with the pressure all depending on your vehicles weight. The correct way to set tire pressure is by looking at your contact area on the the road after driving but it's made easier with stated recommendations. Just because they rate a max of 45-50, etc... doesn't mean you can or should.

By the way, I get lower mpg now then when it was bone stock. Also I didn't ask a question here just observing peoples reasoning!!!

Kalispel · 09-29-2015, 04:04 PM

Doing 37 PSI here currently, and averaging 38 MPG (95% city/in-town driving), but the ride on lower-profile SE 195/60 tires on poorly maintained/constructed roads can be pretty brutal sometimes - and occasionally causes some annoying door-area rattles that don't otherwise manifest themselves on decent roads.

I might try and drop down to 33 PSI soon and see if the ride improves on those rough, jarring in-town Phoenix roads.

09-28-2015, 06:33 PM	#37
Rigaud Drives: 2009 Yaris Join Date: Jan 2014 Location: Rigaud, Quebec, Can. Posts: 357	Wow, such high tire pressure with no benefit at all from what I'm reading here. - 205/45R16 - lowered 1.5", 1ZZ TB, 1ZZ intake manifold, header, 2-1/4" SS freeflow exhaust end to end, TRD sway bar. - 26 psi rear, 30 psi front - 65-70 mph = 35-37 mpg - 50-55 mph = 41-43mpg I just drive the car, nothing special!! __________________ 2009 Toyota Yaris (Little toy) 2002 Audi A4 Avant Quattro 3.0L (Big boy toy) 1998 Subaru Legacy GT 2.5 (winter & DD)

09-28-2015, 10:37 PM	#39
soldout Drives: 2010 Blazing Blue 3 Door LB Join Date: Dec 2013 Location: PA Posts: 70	Rigaud - you have modded your Yaris which might increase your MPG but the larger heavier tires subtract from your MPG. My yaris is bone stock with the addition KNN filter and about 100lbs of stereo equipment. Even if increase tire pressure only gave me .1MPG per tank increase Id still do it. My Crosstrek hybrid has active grill shutters and aero wheels which are heavier then standard wheels. Doubt those 2 things combined even provide 1MPG increase but its still something the engineers are thinking of to squeeze every last .1 MPG __________________ 15' - Crosstrek Hybrid ~ Plasma 10' - Yaris 3 Dr LB ~ The Boom Box 06' - RSX Type S ~ H.S. Dream Car 95' - Delsol VTEC ~ The Racecar 12' - Burgman 400 ~ Garage Queen 09' - Agility 125 ~ 80mpg Daily Rider 09' - Metropolitan ~ Weee 14' - Ecosmart Metro ~ Razor

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09-28-2015, 06:46 PM	#38
fourbangingfun Drives: 2007 Toyota Yaris Sedan Join Date: Mar 2013 Location: MA Posts: 105	34 psi 41-43 mpg summer 34-38 mpg winter Massachusetts Sent from my iPhone using Tapatalk

09-29-2015, 04:04 PM	#41
Kalispel View User's Garage Drives: '15 Yaris SE 5MT Join Date: Jun 2014 Location: Arizona (USA) Posts: 1,058	Doing 37 PSI here currently, and averaging 38 MPG (95% city/in-town driving), but the ride on lower-profile SE 195/60 tires on poorly maintained/constructed roads can be pretty brutal sometimes - and occasionally causes some annoying door-area rattles that don't otherwise manifest themselves on decent roads. I might try and drop down to 33 PSI soon and see if the ride improves on those rough, jarring in-town Phoenix roads.