decrease in mileage

[wombatyaris]

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]

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]

C'mon in and join the discussion!

Winter Gas Causing Drop in MPG? (http://www.yarisworld.com/forums/showthread.php?t=24473)

Cheers! M2

[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.

[mark schofield]

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]

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]

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

[Conor]

Winter weather and winter gas are 2 different things.

Not in Ireland they're not :)

[b_hickman11]

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?

[UTVitz]

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

[Conor]

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.

[b_hickman11]

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

I'm guessing they don't have an EPA over there.....

[knowmercy]

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.

[Conor]

I'm guessing they don't have an EPA over there.....

Your having a laugh mate :
http://en.wikipedia.org/wiki/Emission_standard

The euro emissions laws are far more stringent than the US.
We Europeans invented fuel efficiency you know :-)

http://www.wisegeek.com/which-are-the-most-fuel-efficient-cars.htm

This is one from 2007, but nuffink has changed since then.
http://www.msnbc.msn.com/id/17344368/

What I was alluding to was the Irish weather, not winter fuel. In Europe, we get the same fuel all year long as the quality is actually better. Google it.

The Yaris is not considered a particularly fuel efficient vehicle over here. It is only average for a European car. Less than average in fact.

I don't understand where people are getting cranky here by the way.
It's only a bit of fun:thumbsup:

[talnlnky]

Your having a laugh mate :
http://en.wikipedia.org/wiki/Emission_standard

The euro emissions laws are far more stringent than the US.
We Europeans invented fuel efficiency you know :-)

http://www.wisegeek.com/which-are-the-most-fuel-efficient-cars.htm

This is one from 2007, but nuffink has changed since then.
http://www.msnbc.msn.com/id/17344368/

What I was alluding to was the Irish weather, not winter fuel. In Europe, we get the same fuel all year long as the quality is actually better. Google it.

The Yaris is not considered a particularly fuel efficient vehicle over here. It is only average for a European car. Less than average in fact.

I don't understand where people are getting cranky here by the way.
It's only a bit of fun:thumbsup:
Dublin.... cool town, did a lil tour of ireland last February with the fiancee. Started in Dublin, went to Kilarney, then to Cork, and Kinsale (sp?) on the southern coast... Kinsale was by far the coolest lil touristy town. I could imagine Dublin being a lot of fun, if I wasn't traveling with the fiancee, We stayed at a hostel in temple bar.... ahaha... that was a bit of a mistake, the fiancee wasn't a big fan of that scene. Would love to go back again, her parents are actually thinking of moving there for two or three years.

[Conor]

Dublin.... cool town, did a lil tour of ireland last February with the fiancee. Started in Dublin, went to Kilarney, then to Cork, and Kinsale (sp?) on the southern coast... Kinsale was by far the coolest lil touristy town. I could imagine Dublin being a lot of fun, if I wasn't traveling with the fiancee, We stayed at a hostel in temple bar.... ahaha... that was a bit of a mistake, the fiancee wasn't a big fan of that scene. Would love to go back again, her parents are actually thinking of moving there for two or three years.

Your most welcome mate, we love your foreigners. :thumbup:

My brother has just gotten enaged, and he wants to have his stag in Vegas, so I have an excuse to gop to the USA for the firest time in my life.

Really looking forward to it, I'll see about extending the trip a little too. The wife won't be too happy be, meh. :headbang:

[b_hickman11]

Your having a laugh mate :


What I was alluding to was the Irish weather, not winter fuel. In Europe, we get the same fuel all year long as the quality is actually better. Google it.



OK you dont make any sense. I asked you if there was difference between your winter and summer gas and you said no. Now you are saying that you never said anything about the gas, you were just talking about the weather.
But then in this same quote you go back an repeat your statement about the gas.......You been sniffing your gas tank, mate?

[Conor]

OK you dont make any sense. I asked you if there was difference between your winter and summer gas and you said no. Now you are saying that you never said anything about the gas, you were just talking about the weather.
But then in this same quote you go back an repeat your statement about the gas.......You been sniffing your gas tank, mate?

At the petrol station (as you call "the pump"), there are four choices.

1. 95 unleaded
2. 98 unleaded
3. Diesel (which is excellent for economy, and very popular)
4. LPG (liquid petroleum gas)

The choices stay the same whether it is winter or summer, the higher octane fuels work just as well in summer as in winter.

What we do is choose different oils mate, depending on what climate you come from, as the temps in the EU vary wildly. -38C in Poland in January, but this winter was unusually harsh for everyone.

Diesel is the best choice, and I heard it has a bad rap in the USA, but we don't use agricultural fuel in diesel cars, in fact, it will destroy the engines.

Diesel gets 80mpg in modern vehicles. Don't think they sell in the USA though. Not sure.... google BMW efficient dynamics for a good example. :wink:

[mr9865]

At the petrol station (as you call "the pump"), there are four choices.

1. 95 unleaded
2. 98 unleaded
3. Diesel (which is excellent for economy, and very popular)
4. LPG (liquid petroleum gas)

The choices stay the same whether it is winter or summer, the higher octane fuels work just as well in summer as in winter.

What we do is choose different oils mate, depending on what climate you come from, as the temps in the EU vary wildly. -38C in Poland in January, but this winter was unusually harsh for everyone.

Diesel is the best choice, and I heard it has a bad rap in the USA, but we don't use agricultural fuel in diesel cars, in fact, it will destroy the engines.

Diesel gets 80mpg in modern vehicles. Don't think they sell in the USA though. Not sure.... google BMW efficient dynamics for a good example. :wink:

I don't know if this will help but in Wisconsin the octane stays the same (87 89 91 93) just the blend changes during the winter.

[b_hickman11]

At the petrol station (as you call "the pump"), there are four choices.

1. 95 unleaded
2. 98 unleaded
3. Diesel (which is excellent for economy, and very popular)
4. LPG (liquid petroleum gas)

The choices stay the same whether it is winter or summer, the higher octane fuels work just as well in summer as in winter.

:

This is the same for the states except for the we dont have LPG at most stations and the octane level is a little lower. What I am saying is though even though the pump still says "89" or "95" octane, in the states the gas is different in the winter and the summer. We have winter gas that is 89 and summer gas that is 89 but they are not manufactured the same way.

[Yaris Hilton]

The octane numbers stay the same in the U.S. as well. What changes is that in the winter, refiners use more of the light, volatile butane and pentane hydrocarbons in gasoline. In the summer, those vaporize too easily and can cause vapor locking of fuel lines, so they're pretty much left out with heavier, less volatile hydrocarbons used. Those don't evaporate well enough in cold weather for cold engines to start easily. The heavier hydrocarbons have more energy per gallon than the light ones.

[eht13]

^ Exactly. To the average consumer, the change from winter to summer is transparent... they have the same octane selection to choose from year-round.