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Old 05-30-2009, 11:15 PM   #1
soup1207
 
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Why is my new 09 Yaris MPG is so low

Hi everyone,

I got my yaris a week ago. It is now 600 miles in total, I filled two time gas.
I divided my total mileage by the total gallon of gas I filled, I only got 33.x MPG in average. My car only come with 7 miles so it should affect a lot in calculation of average mpg.

I saw everyone here have a mpg above 35 and many of them have it close to 40 or even more...

Can anyone tell me why please?
How can I have a mpg like that?
The mpg of 09 yaris is 29 local and 35 highway.... How can all you guys have it more than 35....><????
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Old 05-30-2009, 11:22 PM   #2
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Your calculation is fine (total miles divided by total gallon).

What you haven't told us is your driving condition. That has everything to do with what type of mileage you should get from your car.

FYI, there was a poster getting 29mpg in NYC. I'd say, that's pretty damn good.
If you do a lot of stop-n-go traffic, you probably won't see over 35mpg easily. On the other hand, if you do 95%+ of your driving on the freeway, then you should see anything from 40mpg+ depending on the traffic & terrain.

Tell us more about your driving situation & your location. Also, measure your tire pressure when the tires are cold (in the morning, or after parking the car for a while).

-SC
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Old 05-30-2009, 11:32 PM   #3
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I would pay more attention to it after break-in
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Old 05-31-2009, 12:21 AM   #4
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As Cosworth pointed out, I only get over 35 if I do more than 90% highway on a tank.
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Old 05-31-2009, 12:31 AM   #5
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The main reason for low mileage is short trips. If the engine doesn't fully warm up the ECU runs the engine rich. It takes three to five miles for the engine to warm up. You need to drive seven miles or more to see 30+ MPG. If you do long freeway runs, you'll get 40 MPG.

Last edited by yaris-me; 05-31-2009 at 03:06 PM.
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Old 05-31-2009, 05:49 AM   #6
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You are assuming that your tank was completely filled by the dealer. When I got my Yaris all the bars were lit. Within 5 miles the first bar went out. Now it usually takes 80 miles for the first bar to go out. My car was 2 gallons short of being full.

Throw out your first tank milage or start calculating from your next fill up and you might see better numbers.
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Old 05-31-2009, 07:17 AM   #7
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Originally Posted by nemelek View Post
You are assuming that your tank was completely filled by the dealer. When I got my Yaris all the bars were lit. Within 5 miles the first bar went out. Now it usually takes 80 miles for the first bar to go out. My car was 2 gallons short of being full.

Throw out your first tank milage or start calculating from your next fill up and you might see better numbers.

Good point.

Don't be discouraged. Like others have said, driving conditions have EVERYTHING to do with MPG. Break-in is probably a factor, and definitely check tire pressure as someone already mentioned.

Keep us posted as you get more miles on your car.

Tom
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Old 05-31-2009, 08:27 AM   #8
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What they said! My mileage has steadily improved with each tank......I started out with 34 MPG and my last tank was 40 (I have ~3000 miles on my car now). Once the engine loosens up a bit you should see a little better numbers, although 33MPG is exactly what the window sticker says you should be getting, so it isn't really "low", per se.
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Old 05-31-2009, 10:38 AM   #9
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I see.
I live in Boston, I drove to Amherst for the first tank of fuel.... it's two hours driving for one trip and totally 4 hours for round trip....
I carelessly forgot I should not drive more than 65 for new car at the first 3000 miles......I drove 80 mph....=___= probably it's the reason I got lower mpg....
second tank of fuel, i spent more time to drive local and to the dealer...which is only half hour driving.....

Can someone tell me what does break in mean? I check dictionary and still don't understand.....
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Old 05-31-2009, 12:20 PM   #10
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Break-in is the time when moving parts have a chance to "wear-in." Engines loosen up a little as they break-in due to less friction. The piston rings wear-in during break-in, also.

Someone else can do a lot better job than I can of explaining what happens during the break-in period, but what I just said is about the extent of my knowledge on the subject.

Tom
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Old 05-31-2009, 03:39 PM   #11
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Quote:
Originally Posted by yaris-me View Post
The main reason for low mileage is short trips. If the engine doesn't fully warm up the ECU runs the engine rich. It takes three to five miles for the engine to warm up. You need to drive seven miles or more to see 30+ MPG. If you do long freeway runs, you'll get 40 MPG.
My Yaris warms up in under a mile (sometimes within a half mile), and we live in very similar climates.

I noticed as slight improvement in MPG after surpassing 5000 miles in my Yaris. I went from ~34-35 MPG to 36-37 MPG. Your car has yet to break in, so give it a little time and don't worry about it until you've at least done your first oil change.

Plus, driving 80 MPH will lower your fuel efficiency. For best results, keep it around 60 MPH. And during the break in period, do not drive at the same speed for extended periods of time, speed up and slow down on occasion as it helps with the break in. By the way, didn't you read your owner's manual? If not, you really should do so before anything else?

Also, is yours a stick or an auto? The auto will likely get a mile or two less per gallon. Plus, how you drive is a big factor. You can't drive it like a track car and expect it to give you great MPG in return.
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Old 05-31-2009, 04:07 PM   #12
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Old 05-31-2009, 04:27 PM   #13
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Originally Posted by MadMax View Post
My Yaris warms up in under a mile (sometimes within a half mile),
warming up and fully warming up are two completely different things. When the "cold" light goes off, it just means its warm enough to use normal shifting. Your engine reaches peak efficiency quite a while after the light goes off.
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Old 05-31-2009, 04:28 PM   #14
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My first tank was 32.4 MPG. I've gotten several in the mid 30's and the last couple have been in the 39 range. I've only gotten over 40 on long highway trips. Real heavy stop and go city traffic would bring it under 30, I'm sure. I don't think it's "low mileage." Some folks live where they have flatter terrain than I do, routes where they don't have to stop much, and other factors that help their mileage. I'm not going to get into P&G, FAS and such advanced hypermiling techniques either, though I well understand the principles.
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Old 05-31-2009, 05:18 PM   #15
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Quote:
Originally Posted by soup1207 View Post
I see.
.....I drove 80 mph....=___= probably it's the reason I got lower mpg....

Can someone tell me what does break in mean? I check dictionary and still don't understand.....
When I drive 80mph I get around 36 mpg. When I drive 60 mph highway I'll get over 40 mph.

You will probably be ok, however as said before break in means to vary your speed and take it easy for the first 500 miles.
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Old 05-31-2009, 05:49 PM   #16
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From my experience with mostly highway driving on entire tanks with an AT sedan:

70-75 mph = high 30's to low 40's
60-65mph = mid to high 40 mpg
50-55mph = low to mid 50 mpg

I've never driven 80 mph for an entire tank before, but when I drove 70-75 for an entire tank in the rain on a long road trip, I got my worst tank mileage at 37.62 MPG.
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Old 05-31-2009, 11:11 PM   #17
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My best suggestion. Change the oil. I had mine for 5-6 months before I changed mine. Brand new, I was getting around 32mpg. After I changed the oil using a Napa gold filter and castrol oil, I now get 40-42mpg.
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Old 06-01-2009, 06:33 AM   #18
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Hey voodoo22, don't you have imperial gallons in Canada?
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