Winter Gas Causing Drop in MPG? - Page 2 - Toyota Yaris Forums

daf62757 · 12-15-2009, 05:14 PM

Quote:

Originally Posted by Yaris Hilton

Yeah, IMO it's foolish to grow food and ferment it to fuel. I've really got no problem with the alcohol in the fuel itself. Most of the purported problems have been exaggerated. I believe our Yarises would be fine if there were 25% ethanol in the gas as they run in Brazil, but we need to develop better sources than corn for biofuels. It's far too inefficient, and has run up food prices.

Sugar cane and sugar beets are far more superior to corn. The corn farmers just have a better strangle hold on our corrupt government.

mdesjarlais · 12-23-2009, 09:14 PM

you guys ever think that the long term fuel trim is boosted up a point or two due to the extra amounts of oxygen being sucked in by the dense winter air? i would hope you get worse mileage, otherwise that bad boy is runnin' lean! also factor in the defroster running almost daily. I get horrible mileage with mine compared to what i should be getting. I also have a slightly heavy foot...

Hershey · 12-29-2009, 12:50 AM

got to figure in taking longer to reach operating temperature during cold than those warmer days . Thus using more gas with higher idle .

TheSilkySmooth · 12-30-2009, 04:19 PM

I was just going to make a thread on this! My last fuel mileage calc with rotella diesel 10w-30 motor oil in the sump was 33.6mpg. Then I just changed over to 3 qts M1 AFE 0w-30 and the rest M1 5w-20. The car now has a real noisy cold start and run for 15mins. I just refilled the tank a 1/2 hour ago and I got 32.4! I dont like this synthetic oil! I was getting 38mpg last winter running PYB 5w-30 dino. I wonder, too, if the exhaust is getting plugged? There is a TSB on this for the 3 door for the exhaust plugging and a free replacemnt exhaust system if you have fumes (sulphur odour) in the car.

vten · 12-30-2009, 08:22 PM

i don't know if it's the gas or else , but my yaris mpg is pretty bad during the winter time ....26mpg

I believe partly because of the remote start engine that running around 10 minutes each time , twice a day ....and Im still using the same tires setup + full header back exhaust ....

oh well Im driving less than 10 miles everyday to work anyway

Yaris Hilton · 12-30-2009, 08:53 PM

It's the remote start. I hate to let a car idle to warm up, though I've done it to defrost windows. All the fuel that's burned at idle is wasted, it increases noxious exhaust emissions, and that's when the engine really builds up sludgy glop in the oil from condensed moisture and partly burned fuel. In the old days it'd often cause cars to trail blue smoke from gummy oil making the piston rings stick in their grooves. Still might, but newer oils suspend sludge better. Much better to drive away and let the engine warm up more quickly.

Black Yaris · 12-30-2009, 09:30 PM

i am very surprised no one has pointed out the fact

stock tires:
Circumference: 74.58 in 1894.3 mm
Revs per Mile: 876.1

your oversized tires:
Circumference: 77.31 in 1963.6 mm
Revs per Mile: 845.1

so that means every 100 miles your car thinks you drive, you actually drive 96.5miles

so you are getting worse mileage than you think

MadMax · 12-30-2009, 10:14 PM

Yo! YarisHilton, what happened to your beard?!?

And Black Yaris, I have checked my speedo against my GPS, and it is accurate. I wondered about this when I initially got the car because I have 17" wheels on it; but either the dealership calibrated the speedo or the larger tires reduced the speedo error (which happened on my Jeep when I went from 29" tires to 31" ones.

And since I've had my Yaris for over a year old, that could not be a factor in the decreased mileage.

Cheers! M2

YarisOwnersDad · 12-30-2009, 10:19 PM

Oversize tires will cause the odometer to register fewer miles than actually driven, not more miles. So, you would be getting better mileage than you think, not worse.

Think of it as the car traveling further for each rotation of the bigger tire because of its greater circumference.

By the way, who was the roundest knight at the Round Table?

Sir Cumference, of course!

Yaris Hilton · 12-30-2009, 11:10 PM

Quote:

Originally Posted by YarisOwnersDad

By the way, who was the roundest knight at the Round Table?

Sir Cumference, of course!

I resemble that!

Time to look like Santa's over till next year.

MadMax · 12-31-2009, 08:51 AM

Thanks YarisOwnersDad, I needed a chuckle this morning!

And ya look younger being "clean cut," Mr Hilton!

Happy New Year to you all!

Cheers! M2

TheSilkySmooth · 01-01-2010, 05:40 PM

I miss the beard!

Yaris Hilton · 01-01-2010, 07:10 PM

Took a bit of getting used to for me, too.

detroiter · 01-03-2010, 12:29 PM

Is anyone elses yaris idling a bit higher even when it's fully warmed up, as compared to when it's a hot summer day and the idle of the car is very low when it's warmed up? Seems like my Yaris keeps a higher idle when it's cold out as compared to a summer day, even after it's fully warmed. Not a HIGH idle, just higher than if it's hot outside.

Yaris Hilton · 01-04-2010, 09:13 AM

Mine does for a good while after the "COOL" light goes out, but it's not actually fully warmed up. After a good long drive, it falls back to a hair over 600 RPM. In a cooler place (it's 19 F here this morning), it might not drop back to normal idle speed.

docB · 01-05-2010, 09:20 AM

If you have the air control set to defrost or defrost/floor, the air conditioning will cycle. That will raise the idle.

hpvampiress · 01-06-2010, 05:38 PM

Quote:

Originally Posted by Yaris Hilton

I often have to put on my defroster and then realize much later I've still got it on when it's no longer needed. The defroster runs the air conditioning compressor, so it eats gas.

Ah! That's probably why my gas mileage has dropped so much lately! Along with winter road as well, of course.

YotaYaris · 01-07-2010, 12:55 PM

I filled up this morning at one of my normal spots and what did I see on the pump.....
10% ethanol
That must be why I am down to 39MPG on average. That and more city driving has made me lose about 3-5MPG.

12-30-2009, 09:30 PM	#25
Black Yaris der Zeck View User's Garage Drives: '05 Audi A4 1.8t quattro Join Date: Sep 2006 Location: Toledo, OH Posts: 5,231	i am very surprised no one has pointed out the fact stock tires: Circumference: 74.58 in 1894.3 mm Revs per Mile: 876.1 your oversized tires: Circumference: 77.31 in 1963.6 mm Revs per Mile: 845.1 so that means every 100 miles your car thinks you drive, you actually drive 96.5miles so you are getting worse mileage than you think __________________

01-07-2010, 12:55 PM	#36
YotaYaris Drives: 09 3dr (sold), 12 SE 5spd : ) Join Date: May 2009 Location: SA TX Posts: 140	I filled up this morning at one of my normal spots and what did I see on the pump..... 10% ethanol That must be why I am down to 39MPG on average. That and more city driving has made me lose about 3-5MPG. __________________ Its all about the MPG's !!

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12-23-2009, 09:14 PM	#20
mdesjarlais yarisnoob Drives: 2009 yaris hatch Join Date: Dec 2009 Location: rhode island Posts: 5	you guys ever think that the long term fuel trim is boosted up a point or two due to the extra amounts of oxygen being sucked in by the dense winter air? i would hope you get worse mileage, otherwise that bad boy is runnin' lean! also factor in the defroster running almost daily. I get horrible mileage with mine compared to what i should be getting. I also have a slightly heavy foot...

12-29-2009, 12:50 AM	#21
Hershey Drives: 08 Yaris sedan auto / Fit auto Join Date: Oct 2009 Location: northeast Posts: 2,897	got to figure in taking longer to reach operating temperature during cold than those warmer days . Thus using more gas with higher idle .

12-30-2009, 04:19 PM	#22
TheSilkySmooth Drives: 08 3DR 5M Bayou Blue; 09 Fos Join Date: Oct 2008 Location: New Hampshire Posts: 622	I was just going to make a thread on this! My last fuel mileage calc with rotella diesel 10w-30 motor oil in the sump was 33.6mpg. Then I just changed over to 3 qts M1 AFE 0w-30 and the rest M1 5w-20. The car now has a real noisy cold start and run for 15mins. I just refilled the tank a 1/2 hour ago and I got 32.4! I dont like this synthetic oil! I was getting 38mpg last winter running PYB 5w-30 dino. I wonder, too, if the exhaust is getting plugged? There is a TSB on this for the 3 door for the exhaust plugging and a free replacemnt exhaust system if you have fumes (sulphur odour) in the car.

12-30-2009, 08:22 PM	#23
vten Drives: red bare bone yaris hb 3dr Join Date: May 2009 Location: columbus Posts: 1,022	i don't know if it's the gas or else , but my yaris mpg is pretty bad during the winter time ....26mpg I believe partly because of the remote start engine that running around 10 minutes each time , twice a day ....and Im still using the same tires setup + full header back exhaust .... oh well Im driving less than 10 miles everyday to work anyway

12-30-2009, 08:53 PM	#24
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	It's the remote start. I hate to let a car idle to warm up, though I've done it to defrost windows. All the fuel that's burned at idle is wasted, it increases noxious exhaust emissions, and that's when the engine really builds up sludgy glop in the oil from condensed moisture and partly burned fuel. In the old days it'd often cause cars to trail blue smoke from gummy oil making the piston rings stick in their grooves. Still might, but newer oils suspend sludge better. Much better to drive away and let the engine warm up more quickly.

12-30-2009, 10:14 PM	#26
MadMax Drives: 2008 Yaris Liftback (Sprocket) Join Date: Oct 2008 Location: San Antonio, Texas! Posts: 2,799	Yo! YarisHilton, what happened to your beard?!? And Black Yaris, I have checked my speedo against my GPS, and it is accurate. I wondered about this when I initially got the car because I have 17" wheels on it; but either the dealership calibrated the speedo or the larger tires reduced the speedo error (which happened on my Jeep when I went from 29" tires to 31" ones. And since I've had my Yaris for over a year old, that could not be a factor in the decreased mileage. Cheers! M2

12-30-2009, 10:19 PM	#27
YarisOwnersDad Is now a Corolla S Owner View User's Garage Drives: 2010 Corolla S Join Date: Mar 2009 Location: Western Kentucky Posts: 460	Oversize tires will cause the odometer to register fewer miles than actually driven, not more miles. So, you would be getting better mileage than you think, not worse. Think of it as the car traveling further for each rotation of the bigger tire because of its greater circumference. By the way, who was the roundest knight at the Round Table? Sir Cumference, of course!

12-31-2009, 08:51 AM	#29
MadMax Drives: 2008 Yaris Liftback (Sprocket) Join Date: Oct 2008 Location: San Antonio, Texas! Posts: 2,799	Thanks YarisOwnersDad, I needed a chuckle this morning! And ya look younger being "clean cut," Mr Hilton! Happy New Year to you all! Cheers! M2

01-01-2010, 05:40 PM	#30
TheSilkySmooth Drives: 08 3DR 5M Bayou Blue; 09 Fos Join Date: Oct 2008 Location: New Hampshire Posts: 622	I miss the beard!

01-01-2010, 07:10 PM	#31
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	Took a bit of getting used to for me, too.

01-03-2010, 12:29 PM	#32
detroiter Drives: 2008 Polar White LB Auto Join Date: Oct 2008 Location: Metro Detroit Posts: 1,238	Is anyone elses yaris idling a bit higher even when it's fully warmed up, as compared to when it's a hot summer day and the idle of the car is very low when it's warmed up? Seems like my Yaris keeps a higher idle when it's cold out as compared to a summer day, even after it's fully warmed. Not a HIGH idle, just higher than if it's hot outside.

01-04-2010, 09:13 AM	#33
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	Mine does for a good while after the "COOL" light goes out, but it's not actually fully warmed up. After a good long drive, it falls back to a hair over 600 RPM. In a cooler place (it's 19 F here this morning), it might not drop back to normal idle speed.

01-05-2010, 09:20 AM	#34
docB Drives: '09 Yaris Sedan Join Date: Oct 2009 Location: Western N.Y. Posts: 75	If you have the air control set to defrost or defrost/floor, the air conditioning will cycle. That will raise the idle.