decrease in mileage - Toyota Yaris Forums

wombatyaris · 01-23-2010, 03:45 PM

I have a 2007 4 door Yaris. I always got 40-42 MPG. Mileage has dropped to 35-36 MPG in the last few months. Tires are properly inflated, oil is changed regularly, air filter and plugs were recently changed with no improvement.

Any suggestions? Thanks.

Yaris Hilton · 01-23-2010, 04:59 PM

Aside from the usual observations about winter gas, running the defroster which turns on the air conditioning compressor and so forth, consider checking your wheel alignment. A slight bit of tire scrubbing really eats gas. Also, an oxygen sensor that's gradually going out can cause a drop in mileage before it gets bad enough to trigger a "Check Engine" light. A 2007 is pretty new for that.

MadMax · 01-23-2010, 10:44 PM

C'mon in and join the discussion!

Winter Gas Causing Drop in MPG?

Cheers! M2

wombatyaris · 01-23-2010, 11:08 PM

The decline in mileage began before the weather changed and I've been through 2 previous winters. My driving habits have been pretty consistent. Will look into the alignment. Thanks.

mark schofield · 01-24-2010, 08:05 AM

Have you tried cleaning the MAF sensor located on the air intake tube coming off the filter box? I remove mine and blow it off with an electronic parts cleaner spray every time I change the oil. There's a DYI here or on the Scion Life forum. They are quite delicate inside.

b_hickman11 · 01-24-2010, 04:39 PM

Quote:

Originally Posted by wombatyaris

The decline in mileage began before the weather changed and I've been through 2 previous winters. My driving habits have been pretty consistent. Will look into the alignment. Thanks.

Winter weather and winter gas are 2 different things.

Conor · 01-24-2010, 07:16 PM

Quote:

Originally Posted by b_hickman11

Winter weather and winter gas are 2 different things.

Not in Ireland they're not :)

b_hickman11 · 01-25-2010, 02:04 PM

Quote:

Originally Posted by Conor

Not in Ireland they're not :)

He doesn't live in Ireland so why the hell would that be important to him?

So the Ireland fuel companies don't have a different formula during the winter and summer?

Conor · 01-25-2010, 04:20 PM

Quote:

Originally Posted by b_hickman11

He doesn't live in Ireland so why the hell would that be important to him?

So the Ireland fuel companies don't have a different formula during the winter and summer?

Nope, we get the same fuel in winter as in summer. 95 or 98 octane.

Conor · 01-24-2010, 07:15 PM

Check your plugs & air filter. I've noticed a dramatic increase in economy since the service I performed the other day. Best 60 quid I ever spent on parts. I managed 55mpg through the city to my parents house on Friday.

I think US gallons are different though, do you guys understand liters / 100km? I can test that way if needed. That's what we use in Ireland, but the wife likes MPG as she is old school

UTVitz · 01-25-2010, 02:16 PM

Check your brakes-you could have either a front caliper or rear shoe dragging a little.

knowmercy · 01-25-2010, 09:47 PM

I get kinda sick and tired hearing about people complain about poor gas mileage. There is stuff all over the internet about it so if you can't look that up I'm not sure there's much hope for you. Also, quit going over the things this guy already said he did... checking the same things over and over is useless.

01-23-2010, 03:45 PM	#1
wombatyaris Drives: yaris Join Date: Jan 2010 Location: at home Posts: 2	decrease in mileage I have a 2007 4 door Yaris. I always got 40-42 MPG. Mileage has dropped to 35-36 MPG in the last few months. Tires are properly inflated, oil is changed regularly, air filter and plugs were recently changed with no improvement. Any suggestions? Thanks.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
-Mileage Thread- -Log your mileage, year, model, color, any problems here...	Kal-El	DIY / Maintenance / Service	322	07-20-2016 11:07 AM
2009 Yaris Mileage	wornways	Fuel Economy Forum	3	07-29-2009 12:42 PM
Mileage Histogram	twowheels	Fuel Economy Forum	0	06-19-2009 08:18 PM
Sedan better gas mileage than LB? 5 month gas chart included	flint_mica_manual	General Yaris / Vitz Discussion	24	03-09-2009 09:24 AM
Performance mods that won't affect/will hardly affect gas mileage??	Mr.Yaris	Performance Modifications	15	07-30-2007 01:32 AM

01-23-2010, 04:59 PM	#2
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	Aside from the usual observations about winter gas, running the defroster which turns on the air conditioning compressor and so forth, consider checking your wheel alignment. A slight bit of tire scrubbing really eats gas. Also, an oxygen sensor that's gradually going out can cause a drop in mileage before it gets bad enough to trigger a "Check Engine" light. A 2007 is pretty new for that.

01-23-2010, 10:44 PM	#3
MadMax Drives: 2008 Yaris Liftback (Sprocket) Join Date: Oct 2008 Location: San Antonio, Texas! Posts: 2,799	C'mon in and join the discussion! Winter Gas Causing Drop in MPG? Cheers! M2

01-23-2010, 11:08 PM	#4
wombatyaris Drives: yaris Join Date: Jan 2010 Location: at home Posts: 2	The decline in mileage began before the weather changed and I've been through 2 previous winters. My driving habits have been pretty consistent. Will look into the alignment. Thanks.

01-24-2010, 08:05 AM	#5
mark schofield Drives: 03 Echo, 04 Scion xA, 02 Range Join Date: Dec 2008 Location: Madison CT Posts: 16	Have you tried cleaning the MAF sensor located on the air intake tube coming off the filter box? I remove mine and blow it off with an electronic parts cleaner spray every time I change the oil. There's a DYI here or on the Scion Life forum. They are quite delicate inside.

01-24-2010, 07:15 PM	#10
Conor Drives: yaris 1.0 petrol (Y2K model) Join Date: Jan 2010 Location: Dublin, Ireland Posts: 18	Check your plugs & air filter. I've noticed a dramatic increase in economy since the service I performed the other day. Best 60 quid I ever spent on parts. I managed 55mpg through the city to my parents house on Friday. I think US gallons are different though, do you guys understand liters / 100km? I can test that way if needed. That's what we use in Ireland, but the wife likes MPG as she is old school

01-25-2010, 02:16 PM	#11
UTVitz Drives: Black Vitz Liftback Join Date: Dec 2008 Location: Salt Lake City Posts: 238	Check your brakes-you could have either a front caliper or rear shoe dragging a little.

01-25-2010, 09:47 PM	#12
knowmercy Drives: Blk 3door Join Date: Jan 2009 Location: Ohio Posts: 22	I get kinda sick and tired hearing about people complain about poor gas mileage. There is stuff all over the internet about it so if you can't look that up I'm not sure there's much hope for you. Also, quit going over the things this guy already said he did... checking the same things over and over is useless.