Toyota Yaris Forums - Ultimate Yaris Enthusiast Site
 

 


 
Go Back   Toyota Yaris Forums - Ultimate Yaris Enthusiast Site > Second Generation Toyota Yaris Main Rooms > Fuel Economy Forum
  The Tire Rack

Reply
 
Thread Tools Display Modes
Old 05-15-2009, 02:35 PM   #1
paraganek
 
paraganek's Avatar
 
Drives: 2008 Yaris Liftback 5 speed
Join Date: Oct 2008
Location: Portland, OR
Posts: 8
Send a message via ICQ to paraganek
Do you get about 4 MPG less during winter ?

After driving Yaris for just over a year I found the 4MPG difference between summer and winter quite interesting.
The thing is I live in Portland, OR and winters are very mild here, we may have 2 days in winter when temperature during a day drops bellow freezing the rest of winter we stay in 40's.
So driving in summer months I average 39MPG and driving in winter I get 35-36MPG. I only drive commuting to work = 100% heavy city traffic, no highways. I do not use A/C.
I bought 2008 Yaris LB manual in March 2008 and have been driving it since.
I have 13000 miles on it.
Is anyone experiencing the same difference between summer and winter MPG ? Would it be the cold winter starts in the morning ? Any ideas ?

Just curious

Feel free to check my Gas Log

Daniel
__________________
paraganek is offline   Reply With Quote
Old 05-15-2009, 02:40 PM   #2
staticorex
 
staticorex's Avatar
 
Drives: Sc'd Yaris Sedan.
Join Date: May 2007
Location: civilwar town.
Posts: 660
I always get worse millage during the cold months. I was told it was an additive in American gas that is supposed to help but has the opposite effect. I'm sure others will chime in to confirm or ridicule me. :p
__________________
Tantum religio potuit suadere malorum.
staticorex is offline   Reply With Quote
Old 05-15-2009, 03:02 PM   #3
AlexNet0
 
AlexNet0's Avatar
 
Drives: '07 Yaris 3dr
Join Date: Nov 2008
Location: Rockland, ME
Posts: 1,638
Send a message via AIM to AlexNet0 Send a message via MSN to AlexNet0 Send a message via Yahoo to AlexNet0
I get like 32 in the winter vs constant 40's in the summer, dont know why
__________________
----------
----------
AlexNet0 is offline   Reply With Quote
Old 05-15-2009, 03:04 PM   #4
justjesus
 
justjesus's Avatar
 
Drives: 2008 Liftback
Join Date: Oct 2008
Location: Orange County
Posts: 962
Cold air vs warmer air. You get more power with the colder air, right? Well, with the warmer air, you get better mileage. I believe it's because it helps with atomizition. Some people do "warm air intakes" cuz of this. I keep meaning to try it myself, but I'm forgetful.. and sometimes lazy
justjesus is offline   Reply With Quote
Old 05-15-2009, 03:13 PM   #5
staticorex
 
staticorex's Avatar
 
Drives: Sc'd Yaris Sedan.
Join Date: May 2007
Location: civilwar town.
Posts: 660
^ The only problem with that is on the dyno I ran hot air and then freezing cold air to the intake and had absolutely no change in hp. Not even a .01 difference. But the theory sounds right. Hmmm....pondering... :p
__________________
Tantum religio potuit suadere malorum.
staticorex is offline   Reply With Quote
Old 05-15-2009, 03:14 PM   #6
SpaceShot
 
SpaceShot's Avatar
 
Drives: 2008 Yaris 5 speed HB
Join Date: Oct 2008
Location: NH
Posts: 171
In the northeast there is summer and winter gas formulations and it seems to add to the effect of temperature.
But the cold temperature affect doesn't require freezing temps to have a hit on your mileage. Much below 50F and I can notice that it takes much longer to get the engine to full operating temperature. Even though the cold indicator goes off around 130F (water temp via ScanGuage) the engine doesn't hit full temp until 182 or so.

Even though the winter here is colder and I get better mileage with a favorable commute, the winter effect is similar, 3-5 Mpg over the same commuting routes for all seasons.
SpaceShot is offline   Reply With Quote
Old 05-15-2009, 03:18 PM   #7
RS_91CAMARO
 
Drives: 08 YARIS
Join Date: Nov 2008
Location: APPLE VALLEY,MN
Posts: 23
I did as bad as 22 MPG in the winter but always warm it up before i go anywhere.
RS_91CAMARO is offline   Reply With Quote
Old 05-15-2009, 03:19 PM   #8
BailOut
Steals terrorist's lunch
 
BailOut's Avatar
 
Drives: 2007 Yaris Liftback
Join Date: Mar 2007
Location: Reno, Nevada, USA
Posts: 1,299
I have 3 things working against me each Winter:

1) Reformulated gasoline
2) Road conditions (300-400 inches of snow each year)
3) Temperatures below 0F many mornings

I cannot get around #1 or #2 but a grille block greatly helps with #3. Without the grille block my average Winter MPG is about -5, but with the grille block it's about -3.
__________________
- Brian

Share the Road


I often carry 2 carpool passengers and mountain bikes
or snowboards/skis over a 4,500 foot elevation difference.
Click the graphic above to see my detailed mileage logs.
BailOut is offline   Reply With Quote
Old 05-15-2009, 05:25 PM   #9
nemelek
DWEED
 
nemelek's Avatar
 
Drives: 3DR 2008 Metorite Metalic
Join Date: Oct 2008
Location: Arizona
Posts: 1,161
Although you don't have "winter" in Portland, the rain and wet roads will lesson your mpg. I get about 3 mpg less during the winter.
__________________
Making a decision without following it with an action is still a fantasy.
nemelek is offline   Reply With Quote
Old 05-15-2009, 08:02 PM   #10
enkid
 
Drives: 07 Yaris Sedan
Join Date: Nov 2006
Location: RI, USA
Posts: 25
I get about 8 to 10 MPG worse in the winter on average
sometimes more, sometimes less

Longer warm up time
Winter formula fuel
Rolling resistance of tires worse when cold
More wind, more rain and snow
enkid is offline   Reply With Quote
Old 05-15-2009, 08:13 PM   #11
paraganek
 
paraganek's Avatar
 
Drives: 2008 Yaris Liftback 5 speed
Join Date: Oct 2008
Location: Portland, OR
Posts: 8
Send a message via ICQ to paraganek
thank you guys for sharing, it makes sense to me now
__________________
paraganek is offline   Reply With Quote
Old 05-15-2009, 10:33 PM   #12
07WYarisRS
HardlyDangerous
 
07WYarisRS's Avatar
 
Drives: 09 Yaris LE, H/B, auto
Join Date: Jul 2006
Location: Ridgeway Ontario
Posts: 573
Almost guys .....


FI engines use more fuel in the winter because of the cooler air temps.
Cold air is more dense there for more oxygen... the engine compensates the would be lean fuel air mixture by adding more fuel.
Thats why carbed engines are adjusted and re-jetted for temp /altitude changes, thats also why racers test before the races for track conditions and ait temps/humidity etc...
Air temps play a huge roll on the F/A mixture
__________________
The early bird gets the worm, but the second mouse gets the cheese.
07WYarisRS is offline   Reply With Quote
Old 05-15-2009, 11:00 PM   #13
thebarber
daily driver
 
thebarber's Avatar
 
Drives: the #wrecho
Join Date: Jun 2006
Location: Grand Rapids, MI
Posts: 5,877
winter is more about different gas, warm up times and all the fluids in/around the engine being cold and thick when you start the car....

i run about 5mpg less in winter....but the only 2 winters ive had the car were in eastern canada where it could be -20C for long stretches and i was doing relatively short in-city trips all the time...though i never let the car warm up TOO much before driving it....
__________________
thebarber is offline   Reply With Quote
Old 05-16-2009, 11:24 AM   #14
GeneW
Banned
 
Drives: 2008 Yaris
Join Date: Oct 2008
Location: Pennsylvania
Posts: 1,034
I've seen this effect, especially with very cold and very hot days. I get my best mileage above 85 fahrenheit.

A heat engine's efficiency improves with greater temperature difference between the "hot" and "cool" side. Unless that block is dropping below normal operating temps I don't see any advantage to blocking off the radiator. The radiator uses a thermostat to regulate block temps anyhow.

My take on it is to use waste heat to heat inlet air. Could be done, probably painlessly, by figuring out how much air the motor draws in, and then estimating how much viscous drag a normal heating core puts on the inlet air. Blend air streams until you get a decent compromise on temps and inlet air drag.

Gene
GeneW is offline   Reply With Quote
Old 05-16-2009, 11:40 AM   #15
Yaris Hilton
Half a Bubble Off Plumb
 
Yaris Hilton's Avatar
 
Drives: 2009 Yaris Sedan
Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
Smile

Quote:
Originally Posted by enkid View Post
Rolling resistance of tires worse when cold
That was impressively demonstrated by the old-fashioned nylon 6-ply bias tires I had on my 1940 Ford. When left sitting for a while, the cords would take a set and "flat spot," which would smooth out after rolling for a while. In cold weather, I'd go thumping down the road on flat spotted tires for quite a while. Modern tire cord materials don't set that dramatically, but they still stiffen up quite a bit. As do the rubbers used in the tread and carcass of the tire.
Yaris Hilton is offline   Reply With Quote
Old 05-16-2009, 12:10 PM   #16
daf62757
Nothing beats a Toyota!
 
daf62757's Avatar
 
Drives: 2013 Yaris 5 dr liftback
Join Date: Jan 2009
Location: Indianapolis, Indiana
Posts: 564
Here in Indiana, it can get really cold and the mileage on my Yaris goes down in cold weather. But warm weather brings about a paradox. You getter about the same mileage because you have your AC on. After reading all these stories...accounts...online about 50 miles per gallon, I have come to the conclusion that they are the exception and not the rule. About 40 MPG...give or take a few...is what you will get with the Yaris if you drive normal, don't speed, drive with the right air pressure, and not add on costly air breathers.

I am hoping the next generation Yaris will get 50 MPG because no matter how new my Yaris is, it is really old technology \.
__________________
Big Dave
Indianapolis, IN

Synthetic Oil....its in my car.....for at least 10,000 miles!

daf62757 is offline   Reply With Quote
Old 05-16-2009, 10:06 PM   #17
Yaris Hilton
Half a Bubble Off Plumb
 
Yaris Hilton's Avatar
 
Drives: 2009 Yaris Sedan
Join Date: Mar 2009
Location: Bristol, Tennessee, USA
Posts: 1,593
Smile

I filled mine today and got 39.8 MPG on alcoholic gas. That was with a bit more highway driving than usual in the mix, but mostly in town. I've been running the AC more lately, too. I'm quite happy with it in any case.
Yaris Hilton is offline   Reply With Quote
Old 05-17-2009, 05:44 AM   #18
anonymous user
rarer than JDM -1 of 1!
 
anonymous user's Avatar
 
Drives: 07yaris
Join Date: Oct 2008
Location: windward oahu
Posts: 402
If i could add my 2cents as well.....
Although I live in Hawaii, daytime temps change maybe 10-18 degrees between summer and winter. Nights can get into the low 50's, but usually 58-60's in winter. That being said, i believe summer and winter gas changes about 4-5 mpg, atleast to my gas logs. 34-35 mpg in winter, 38-40 in summer.
__________________
It's not what you drive, or how much $$ you throw at the car. Mod the ballast on the front left first!

anonymous user is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
My progression into hypermiling BailOut General Yaris / Vitz Discussion 8 10-13-2009 06:31 PM
Help me see 55 mpg! Loren Fuel Economy Forum 76 04-02-2009 04:23 PM
toronto weather mpg in winter!! marcus Fuel Economy Forum 9 12-23-2008 10:29 AM
Anyone from Missouri? MPG problems inside 4MPG Fuel Economy Forum 31 12-17-2008 05:48 PM
Official "CASTREX" WINTER THREAD CASTREX Off-topic / Other Cars / Everything else Discussions 13 10-24-2008 08:19 AM


All times are GMT -4. The time now is 04:10 PM.




YarisWorld
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.