Fuel Economy

[MarkBen]

Over 42 a gallon... wow. I am still on the tank the dealer gave me, and hopefully will be for atleast a week, so I will see how my mpg is when I fill up. I have heard that the engine needs to 'break in' a bit before the true mileage becomes apparent, is that true?

[roxy84]

i am at 407.3 miles, still on the dealer tank. i still have 2 bars left, but i think the second to last bar is about to go. the tank has been 80% highway with very minimal a/c usage. much of the driving has been at 45-60 mph, so pretty optimal conditions for good mileage. i was SO worried that i would not get the same mileage i got with my 5 speed corolla, but it appears my fears are being put to rest quickly.

the only thing ive done is shift conservatively--at 12 mph-22 mph-32 mph-42 mph and accelerate gently. ill report back when i do a fill for an exact figure.

[nsmitchell]

Originally Posted by MarkBen

Over 42 a gallon... wow. I am still on the tank the dealer gave me, and hopefully will be for atleast a week, so I will see how my mpg is when I fill up. I have heard that the engine needs to 'break in' a bit before the true mileage becomes apparent, is that true?

I'm just over 15K miles. Smooth as silk!

[petesimac]

Just got back from a trip to Florida (from Pittsburgh) and got anywhere from 43.5 to 46.3 mpg on 4 tanks of gas (currently on the last fill-up), with different terrains and different conditions (ac on some of the time, off some of the time), plus, the car was loaded with luggage, two adult sized people and one 11 year old. 95% of the ride was highway, but here and there with traffic jams and some city driving once I got to Atlanta and then Orlando, there was some city driving as well. I must say, I'm really happy. Now if I can only get the 34 mpg that they promise for city driving; my 1st tank with 95% city driving got me 30.4 mpg. I was a little disappointed with that, but I don't know how full the Toyota guys and gals filled the tank, so it might have been half a gallon or so shy of full -- that might have made a 3.6 mpg difference; we'll see.

[DreagonR]

Hello everyone... I just recently Drove from Toronto to Conneticut and since i had to drive on the i90 for around 490km i decide what better way to measure my MPG. Well it turns out i did 145.08 miles per 4.498 US gal.

145.08 miles / 4.498gal= 32.254 miles per gal.

17.02liters / 234.0km *100km= 7.274 liters per 100 kilometer.

Which is pretty bad considering Toyota advertises their fuel efficiency at
40mpg on highway.

By the way i have a Manual Hatchback, and yes i did have my AC on... so that should also take up a few MPG but i can't even get close to the 40mpg that Toyota Advertises. Even with the AC on that should only add around 10% of fuel consumption which would bring me up to 35.479MPG. still no where near their 40MPG advertise. I'm wondering if my car is defective??

I have Synthetic Oil in my engine and I recently checked my tire preasure... which is to manufactures recommendation.

this just confuses me too much...

my car has already been broken in... i have around 20 000 kilometer on it.
:(

[keesue]

10K miles and averaging 39 mpg. Wow....

[nsmitchell]

Originally Posted by DreagonR

Hello everyone... I just recently Drove from Toronto to Conneticut and since i had to drive on the i90 for around 490km i decide what better way to measure my MPG. Well it turns out i did 145.08 miles per 4.498 US gal.

145.08 miles / 4.498gal= 32.254 miles per gal.

17.02liters / 234.0km *100km= 7.274 liters per 100 kilometer.

Which is pretty bad considering Toyota advertises their fuel efficiency at
40mpg on highway.

By the way i have a Manual Hatchback, and yes i did have my AC on... so that should also take up a few MPG but i can't even get close to the 40mpg that Toyota Advertises. Even with the AC on that should only add around 10% of fuel consumption which would bring me up to 35.479MPG. still no where near their 40MPG advertise. I'm wondering if my car is defective??

I have Synthetic Oil in my engine and I recently checked my tire preasure... which is to manufactures recommendation.

this just confuses me too much...

my car has already been broken in... i have around 20 000 kilometer on it.
:(

32MPG on the Highway? That sounds strange. On my recent trips I too had my AC on the whole time. What speeds were you going? I was following the speed limits. I also think an alignment check at the dealership may be needed. Get them to do it for free because of your poor mileage. It's worth a shot.

[roxy84]

ok, i ended up at 431.8 miles when the second to last bar disappeared. i filled up immediately. it took 10.169 gallons to fill (i thought it would take less gallons to fill when the last bar began to blink).

anyway, that put my mpg at 42.46. i will not complain. based on what many others have gotten, i expected this type of mileage on a mostly highway tank. however, i didnt think id get it on my first tank.

[BailOut]

I fueled up this morning after just 10 days (which tells you how much extra driving I've had to do lately - ugh). I've not had even one highway trip this tank to offset all of the errands and the extra commute.

424.2 miles on 8.431 gallons = 50.314 MPG

[marcus]

i been driving normal.. and im barely getting 14km/l most i did was 14.5 per liter.. thats about 6.9 l/100km. 5.5-6.9.. i should atleast be in between.. and my car has almost 5000 km on it. i dont get it..

[eTiMaGo]

Originally Posted by marcus

i been driving normal.. and im barely getting 14km/l most i did was 14.5 per liter.. thats about 6.9 l/100km. 5.5-6.9.. i should atleast be in between.. and my car has almost 5000 km on it. i dont get it..

It's a lot to do with your driving distances, I think, maybe you are in the same situation as me.

Normally I have very short commutes (<5km), and the first bar on the gauge drops after 50km.

Right after my last fillup, I went on a much longer trip, almost 100km, and the first bar only dropped after about 75km.

I don't go on long drives like this very often, but if I did, I am sure the overall mileage would be a lot better!

[stuffy]

@dreagonr, i drove that same stretch last summer and averaged 45 mpg, with an average speed of 110km/h,

i think you've got some funny math at work there:

Well it turns out i did 145.08 miles per 4.498 US gal.

wtf? how did you arrive at these numbers?

best way to figure out mpg is to fill the tank, set the trip odomoter to 0,
refill the tank when it's empty, write down volume of fuel and odometer mileage,
divide distance by volume of fuel.

[marcus]

Originally Posted by eTiMaGo

It's a lot to do with your driving distances, I think, maybe you are in the same situation as me.

Normally I have very short commutes (<5km), and the first bar on the gauge drops after 50km.

Right after my last fillup, I went on a much longer trip, almost 100km, and the first bar only dropped after about 75km.

I don't go on long drives like this very often, but if I did, I am sure the overall mileage would be a lot better!

well i live in town.. there may be some shorts trip going to friends house to work id say about 60% hwy.. my first bar actually goes to 120km..but still with that im barely hitting 600 down to empty.. last bar normally blinks at about 530-540 km.. hmmm i wonder...

[marcus]

heres mine.
1st tank 540km with 39.8l fill up = 38.34mi/gal with regular 87 octane
2nd tank ran 535km fill up 38.4l = 39.37mi/gal with premium 89 octane
3rd tank 540km 37.5l fill up=40.69mi/gal with premium 89 octane
4th tank 570km premium fill up @38.00 liters =42.40 m/gal -15km/liter 89 octane
5th tank went to regular gas..48.2 liters ran 711 km 40% hwy (had to add 10 liters in between), calculated about 6.7l /100km,,41.68m/gal ... i was expecting about 6.0 l/100,,,atleast...

but this is from different fuel calculation.. so now im confused...

im doing it by how much km run on the filled up fuel..ex. 550 fill up @ 38.5 l= 14.28 km/liter

[swng]

I am really pleased to see fellow members find F.E. an interesting subject. For everyone's convenience, I repost here some useful links which I think can help calculate our yaris' mpg:

http://www.roity.com/petrol/metcalc.html

http://oee.nrcan.gc.ca/transportatio...ut.cfm?attr=16

http://www.rockymountainmoggers.com/convert.html

https://www.fueleconomy.gov/mpg/MPG.do?action=calcMPG

http://www.vehicleservice.co.za/calc/fuel.html (refers to Imperial gallons)

http://www.sciencemadesimple.net/fuel_economy.php

http://www.hicloneqld.com/fuelcalculator.html (refers to Imperial gallons)

There is useful conversion assistance at the bottom of this page:

http://www.hicloneqld.com/data.htm (refers to Imperial gallons)

The above links do not represent an exhaustive list. Please post any links here if you find them safe and helpful. Edit: Also, use any of these links at your own risk.

Edit: Thanks to marcus, there is another one:http://www.accommodationz.co.nz/economycalculator.html (Post #1422 of this thread) Apparently it is for imperial gallons.

[Edd]

Doesn't the yaris have anything on an LCD screen that tells you the current average fuel consumption? I know some other cars in its class (swift) have that.
The problem is how would you accurately calculate it. From my experience, fuel gauges often stay near the top, then suddenly start dropping faster, so that's too innacurate. The only way I could see this working is if you took the SAME point on the scale, eg the 1/4 mark. Then you fill up with fuel and look at what the petrol bowser says in litres. Reset your trip meter and when the fuel gauge gets back down to that same 1/4 mark you know you have used up that x amount of litres you filled up with and you know how far you went from the trip meter.
Is that how you guys do it?

[Edd]

EDIT: Read this post AFTER the one below it, it's in response to that.

Thanks for that, can anyone in Aus confirm if you got a fuel consumption computer?

[swng]

Thanks Edd, for raising this point.
Some Yari in Australia and Europe may have an onboard computer (which I think is an alternative name for a gauge/meter showing some useful information including and not limited to e.g. average fuel consumption). However, as of now, Yaris models sold in North America are not equipped with trip computers that can show the fuel economy of the cars as they go. We who live in Canada and the United States have to calculate our cars' mpg numbers by ourselves. Alternatively, we can install an aftermarket gauge in the car to show us the relevant data. I do not have one so I am unable to describe in detail how those gauges may help in this respect. All I know is a couple of gauges available in the market are very useful.
To calculate the mpg numbers, I use one of the calculators available on the internet, the links to which are seen in Post #1350. The calculations are accurate but of course, errors may occur in one area or another during the self-help process. Yet, hopefully, in the long term, i.e., after a number of tanks and calculations, a reasonably accurate average number can be arrived at.
BTW, the methods of calculations/calculators that I have been talking about are not affected by the anomaly about the fuel guage graduation/indication you described.