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Old 02-05-2019, 08:56 AM   #1
2bz
 
Drives: 2008 Yaris 3DR Hatch MT
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Poor MPG tried everything - need advice

Ok, my kid just got a 2008 3 door hatchback with 102K miles. I bought it for his older brother, four years ago and he handed it down recently. I am a maintenance fanatic and do everything old-school. Changed every fluid, filter (except the in-tank fuel filter), plugs, brakes, rotors, new tires, bulbs, etc., etc. Recently, I filled up the tank and noticed that it got 24.6 MPG. I asked the previous owner, my oldest boy, what he was getting and he said "never more than 300 miles from full to dead empty". Don't you just love hearing about a 4 year old problem?!?

So now I'm on a mission. So far, I have/am:

Checked tire pressure
Full alignment
Checked for dragging brakes (IR pyrometer, free rolling)
Cleaned MAF and throttle body
Not running with AC on
Using local/no-name fuel
Not throwing any codes (per local parts store OBD2)
Not heavy footed

I believe that the injectors and both O2 sensors are original issue and I just ordered reman OEM Denso injectors and new Denso upstream and downstream sensors.

What advice do you have and what might I be missing? Thanks in advance.
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Old 02-05-2019, 09:00 AM   #2
dogsridewith
 
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Toyota Yaris fuel consumption effeciency mileage

How do you know that driving isn't "heavy footed" when you're not in the car?
Maybe trade cars and drive that Yaris for a tankfull or two?
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Old 02-05-2019, 10:02 AM   #3
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Originally Posted by dogsridewith View Post
How do you know that driving isn't "heavy footed" when you're not in the car?
Maybe trade cars and drive that Yaris for a tankfull or two?
My oldest drives like my grandmother, so if there wasn't consistent results, I would say yes. Also, I 'm not giving my 17 year-old my BMW 335iX.
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Old 02-05-2019, 10:33 AM   #4
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What are your expectations? From what you've said, the vehicle is tracking pretty close to my numbers and we probably have nearly the same environmental conditions. Given the extreme cold over the past week, I'd expect nothing better than 24.6 mpg.

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Old 02-05-2019, 10:43 AM   #5
2bz
 
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Originally Posted by WeeYari View Post
What are your expectations? From what you've said, the vehicle is tracking pretty close to my numbers and we probably have nearly the same environmental conditions. Given the extreme cold over the past week, I'd expect nothing better than 24.6 mpg.

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My MPG expectation over time (years) would be somewhere close to the original 29 city / 36 highway numbers.
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Old 02-05-2019, 10:48 AM   #6
myfirstyota
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Is there 'winter gas' where you are? Apparently mileage goes down on that stuff.
Exhaust leaks can also cause a bit of a drop.

You didn't mention it but I assume it's covered in the general maintenance you did, air filter.

Also if there's a lot of short trip city driving, I don't get too far off what you're getting for mileage.

How's the terrain in your area? Hilly or flat?

Any extra weight on board? Ie. Unnecessarily full trunk? Weight kills these cars.
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Old 02-05-2019, 11:00 AM   #7
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My lifetime average is 31.37 mpg.
Absolute worst was 24.17 mpg.
Absolute best was 46.51 mpg.




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Old 02-05-2019, 12:32 PM   #8
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Originally Posted by WeeYari View Post
My lifetime average is 31.37 mpg.
Absolute worst was 24.17 mpg.
Absolute best was 46.51 mpg.
Your lifetime average is consistent with what I usually see from tank to tank. Having said that, I probably have added weight over stock and do not drive like a grandma, so 24 MPG for a kid that drives like a grandma is a little suspect, imho.
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Old 02-05-2019, 12:38 PM   #9
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Quote:
Originally Posted by myfirstyota View Post
Also if there's a lot of short trip city driving, I don't get too far off what you're getting for mileage.

How's the terrain in your area? Hilly or flat?

Any extra weight on board? Ie. Unnecessarily full trunk? Weight kills these cars.
I agree with this. On the highway I can easily get in the 40s, but even on back roads with hills, occasional stop signs, and old country drivers in front of me my mileage is normally around 35-36 MPG.

I have also noticed decent drop in mileage when I'm carrying a lot of weight, or other people.
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Old 02-05-2019, 12:57 PM   #10
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Originally Posted by ern-diz View Post
so 24 MPG for a kid that drives like a grandma is a little suspect, imho.
OP is in Pennsylvania and it has been very cold of late hence latest fill-up will inherently be bad. Also, an unknown at this point is what type of driving the kid does. I suspect it is not long haul freeway stuff. More likely to be short hop, cold engine jaunts.

My advice, have the kid start maintaining meticulous fuel logs. Don't try chasing down causes for suspected bad f/e numbers in the middle of winter. This car absolutely hates the cold.


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Old 02-05-2019, 01:19 PM   #11
IllusionX
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Winter I do about 24-25mpg. I don't care about fuel consumption anymore.

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Old 02-05-2019, 01:21 PM   #12
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Winter I do about 24-25mpg. I don't care about fuel consumption anymore.

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Hehehe, I'm in the same boat - life became more fun that way
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Old 02-05-2019, 01:22 PM   #13
IllusionX
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I mean there are no possible way I can do less than 7.5L/100km. Screw hypermiling. I almost never see highways anymore.

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Old 02-05-2019, 02:12 PM   #14
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Quote:
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Winter I do about 24-25mpg. I don't care about fuel consumption anymore.

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When I was younger and had a crappy job I cared very much, now not so much but I do keep track for curiosity and to make sure there aren't any significant drops that could point to an issue with the car.
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Old 02-05-2019, 02:32 PM   #15
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24.6mpg isnt bad for the winter...
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Old 02-05-2019, 02:35 PM   #16
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Quote:
Originally Posted by WeeYari View Post
OP is in Pennsylvania and it has been very cold of late hence latest fill-up will inherently be bad. Also, an unknown at this point is what type of driving the kid does. I suspect it is not long haul freeway stuff. More likely to be short hop, cold engine jaunts.

My advice, have the kid start maintaining meticulous fuel logs. Don't try chasing down causes for suspected bad f/e numbers in the middle of winter. This car absolutely hates the cold.
Makes sense. I would defer to you since I'm in the land of basically no cold lol. I've been surprised by this week of rain we've had.
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Old 02-05-2019, 04:57 PM   #17
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According to torque, I'm averaging 40.8 mpg (imperial gallon) so about 34 mpg (US) on winter gas. This is about 75% highway driving. Neither I nor my wife are lead-footed. I expect an improvement in the summer.
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Old 02-05-2019, 05:01 PM   #18
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According to torque, I'm averaging 40.8 mpg (imperial gallon) so about 34 mpg (US) on winter gas. This is about 75% highway driving. Neither I nor my wife are lead-footed. I expect an improvement in the summer.
Pretty good, if torque can be trusted. I find that the only true measurement is manually calculating with every trip to the pump.

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