|
01-16-2017, 03:59 PM | #1 |
Drives: Toyota Yaris Join Date: Jan 2017
Location: Connecticut
Posts: 2
|
Gas Mileage is dropping.
I have 2008 that I have owned since Oct 1 2012. Approaching 105,000 miles. Notice mileage has dropped from 30-35 to about 25 miles per gallon this winter. I've been told this is normal but I don't remember it lowering in previous winters. I have not gotten a tuneup...I have gotten regular oil changes in 16 pt. look ins with the deal I made..Just got new brakes and tires a few months ago. Could the new tires have caused a problem if not aligned right or should I just get a tune up (maybe check fuel injection)...should I go to a Toyota dealer or stick with the place I get free oil changes, which is a large dealer but doesn't regularly work on Toyotas?
|
01-16-2017, 05:13 PM | #2 |
mileage does drop over winter but dropping to that extent is a bit much. I would assume with the 16pt inspection they checked air filters and the such, but yeah i might suspect fuel injection.
|
|
01-16-2017, 05:58 PM | #3 |
Drives: '08 2zr swapped Vios M/T Join Date: Oct 2012
Location: Caledonia Ont.
Posts: 2,938
|
to put it in perspective I usually go from 5.5L/100km to 6.7L/100km from summer to winter. I'd personally wait until spring time and see if it goes back, if not then likely something going on which could be a bunch of things
__________________
No one ever wants to give a Yaris the point by... |
01-16-2017, 07:08 PM | #4 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
|
If it doesn't recover there a good chance the AFR sensor is loosing resolution with that much mileage. But tires can also effect mileage too.
|
01-17-2017, 09:48 PM | #5 |
Only Happy When it Rains
|
New tires will absolutely drop gas mileage. So will winter gas. Have you had the transmission fluid changed? That will also drop gas mileage when it gets really dirty. Check the tire pressures, too low will cause worse gas mileage. I'd pump it up as high as you are comfortable with, I personally go the highest my tires say they can be inflated.
__________________
Colin Chapman disciple |
01-18-2017, 12:06 AM | #6 |
Drives: '14 GT86, '08 Vitz Join Date: Dec 2006
Location: Central Valley, CA
Posts: 9,873
|
Could be the brakes??? The pistons may not have been reset and are touching the rotors too much. The same with the rear if you replaced the shoes, may have been over adjusted and the shoes are riding the drums.
If you got extremely sticky tires, that'll cause a drop in mpg. Spark plugs may be fouled by now (I think they're supposed to be changed at 120k). I know I changed them in my previous Yaris at 61k. MAF sensor may be dirty, as the TB may be as well. Winter gas blend drops the mpg some, and even more so if it's a bad batch of gas. I remember getting a couple bad batches of gas in my previous Yaris, and my mpg went down about 8 mpg. How quickly were the pumps flowing the last few times you filled up? |
01-18-2017, 09:33 AM | #7 |
Obsessed with 1.5L
Drives: '10 PW Yaris Sedan Join Date: Feb 2011
Location: Westminster, MD
Posts: 907
|
What everyone said.
Tires are a major player, tune up, dirty maf (i clean mine every 15k) your brakes and winter fuel Maybe they have your rear brakes adjusted up too much
__________________
-Greg...the Exhaust Freak. -10 PW sedan 107whp/110wtq, full exhaust, suspension bits, TRD LSD -06 Highlander 3mzfe Limited AWD -82 Malibu, 1uzfe swap -97 Tercel coupe, 1nzfe/4.31 -96 Tercel coupe, Turbo 5efe, autoX -96 Tercel 4dr |
01-18-2017, 01:28 PM | #8 |
Drives: Toyota Yaris Join Date: Jan 2017
Location: Connecticut
Posts: 2
|
Thank you everyone. I called Munro which did my brakes and tires and they were mystified. They don't have email.(really) and said I could print this out and bring it in.
|
01-18-2017, 02:30 PM | #9 |
Drives: 2020 Corolla Join Date: Apr 2012
Location: Canada
Posts: 549
|
I wouldn't worry about it .. my Yaris I am getting about 20 MPG US now in the winter compared to about 39 MPG US in the summer.
So a decrease about 50% in my gas mileage during the winter. |
01-18-2017, 09:48 PM | #10 |
Obsessed with 1.5L
Drives: '10 PW Yaris Sedan Join Date: Feb 2011
Location: Westminster, MD
Posts: 907
|
My car usually drops 3-4mpg for winter. Then i put my grille blocks in and I nearly get all of it back
__________________
-Greg...the Exhaust Freak. -10 PW sedan 107whp/110wtq, full exhaust, suspension bits, TRD LSD -06 Highlander 3mzfe Limited AWD -82 Malibu, 1uzfe swap -97 Tercel coupe, 1nzfe/4.31 -96 Tercel coupe, Turbo 5efe, autoX -96 Tercel 4dr |
01-19-2017, 02:27 AM | #11 |
Drives: 2014 Yaris SE Join Date: Apr 2014
Location: NYC
Posts: 1,076
|
|
01-22-2017, 07:52 AM | #12 |
Drives: 2008 Yaris Liftback (Sprocket) Join Date: Oct 2008
Location: San Antonio, Texas!
Posts: 2,799
|
Agreed, a couple of MPG for winter gas is normal; but not 30-35 MPG down to 25 MPG.
You've got another issue.
__________________
|
01-22-2017, 10:49 AM | #13 |
Drives: 47 2013 yaris l hatchbacks Join Date: Nov 2016
Location: Renton, wa
Posts: 64
|
You definitely have something going on here. That's just too drastic of a change not to be. With no check engine being illuminated that kind of Narrows what the problem could be. I will run down a quick list of possibilities from most likely to least likely.
1 the mass airflow sensor located on top of the air filter assembly has become contaminated. 2 the air fuel ratio sensors are oxygen sensors as some call them in the exhaust system before the Cadillac converter have become contaminated and are working extremely slowly. They work on being heated by internal heaters and exhaust temperature so this problem possibly could get worse with extreme cold weather. 3 your fuel injectors have been contaminated and are plugged and the spray pattern is very poor leading to poor fuel atomization. 4. There is something wrong with your battery or electrical generation system. I have seen ones with internal plate shorts in the battery that cause the battery to have a very low ohm rating. This cause the alternator to work at 100% duty cycle all the time and dragging down the performance of the engine and the overall gas mileage. Also all modern cars require a very steady good supply of electrical current and a poor battery can cause all kinds of wacky stuff Sent from my SAMSUNG-SM-N900A using Tapatalk |
01-22-2017, 11:08 AM | #14 |
Drives: 2006 Yaris RS 3-Door Join Date: Feb 2016
Location: YYZ
Posts: 329
|
Put in new plugs and clean or change the MAF sensor. Also change the air filter, unless it's already been changed recently. Those are the basic things you need to do. Then check the mileage again.
Sent from my LG-D801 using Tapatalk |
01-22-2017, 11:11 AM | #15 | |
Drives: 47 2013 yaris l hatchbacks Join Date: Nov 2016
Location: Renton, wa
Posts: 64
|
Quote:
Sent from my SAMSUNG-SM-N900A using Tapatalk |
|
01-22-2017, 09:20 PM | #16 |
Drives: 2006 Yaris RS 3-Door Join Date: Feb 2016
Location: YYZ
Posts: 329
|
Nothing to do with misfiring. Heavily used spark plugs degrade engine performance.
Sent from my LG-D801 using Tapatalk |
01-22-2017, 09:26 PM | #17 | |
Drives: 47 2013 yaris l hatchbacks Join Date: Nov 2016
Location: Renton, wa
Posts: 64
|
Quote:
Sent from my SAMSUNG-SM-N900A using Tapatalk |
|
01-23-2017, 11:51 PM | #18 | |
Drives: 2008 Red Toyota Yaris Join Date: Mar 2011
Location: MN
Posts: 76
|
Quote:
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Fuel Economy | swng | Fuel Economy Forum | 2089 | 01-23-2015 06:41 PM |
Winter Gas Causing Drop in MPG? | MadMax | Fuel Economy Forum | 66 | 03-21-2010 04:46 PM |
Gas mileage logging online? | colb | Fuel Economy Forum | 8 | 03-13-2009 03:41 PM |
Gas mileage and A/C | Chaad32 | General Yaris / Vitz Discussion | 18 | 01-29-2009 04:31 PM |
Tired of poor gas mileage & buying premium gas. | Boosted Peon | New YARIS Purchase Forum | 29 | 08-25-2006 08:59 PM |