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Old 01-18-2009, 08:30 PM   #1
yoon89
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Default Interesting website to compare fuel economy

I was wondering if I'm getting the right mileage out of my car.
So, I started recording my fuel economy on www.fuelly.com.

Being stock except 245mm wide tires, I could barely get about 350km out of a tank of gas. And the website converted to 19.0 MPG when I ran a full tank of gas with no boost the entire time.

Would you say this is common among stock STI's?

Thank you!
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Old 01-18-2009, 08:48 PM   #2
truenosan
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I think that is a little low. Do you drive hard?
What kind of gas are you putting in?
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Old 01-18-2009, 09:01 PM   #3
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I get about around 400 - 450 km on one full tank if I don't drive hard.

how often are you driving on the hwy/city?
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Old 01-18-2009, 09:02 PM   #4
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Quote:
Originally Posted by yoon89 View Post
I was wondering if I'm getting the right mileage out of my car.
So, I started recording my fuel economy on www.fuelly.com.

Being stock except 245mm wide tires, I could barely get about 350km out of a tank of gas. And the website converted to 19.0 MPG when I ran a full tank of gas with no boost the entire time.

Would you say this is common among stock STI's?

Thank you!
Isnt tracking by the tank of gas an inaccurate measurement? I just filled up and got 11.1l/100 kms. Or 420 kms from the tank with about an 1/8 left.
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Old 01-18-2009, 11:04 PM   #5
cpelton
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I'm pretty steady at 19mpg around town I use the accufuel app for the iPhone
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Old 01-18-2009, 11:38 PM   #6
FunkMasta
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seems like an interesting site...
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Old 01-19-2009, 02:05 AM   #7
truenosan
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I get about 400 km/tank. I'm running an AP tuned on 94.

My cars fuel mileage has been about the same since I bought the car.
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Old 01-19-2009, 02:48 AM   #8
alan ling
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My car sucks on gas. I think it has something to do with my heavy right foot. Boost is addictive.
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Old 01-19-2009, 03:01 AM   #9
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Seems perfectly fine.... but then again I can have a toyota tercel and say I get only 200 km on a tank if I drive in downtown all day. But when I hit the highway it's a totally different story.
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Old 01-19-2009, 10:41 AM   #10
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I get about 200 miles out of a tank before I actually fill up.

It's always pretty much right on 1/2 at the 100 mile mark.

The low fuel light is on now because I have been waiting for the price of gas to come down but it's actually going up here in Kelowna... ****ing brutal.

The price of oil has dropped to below $35 but the price of gas is going up??? F That!

Anyways, the max I can get out of a tank is probably around 220-230 miles which translates to around 350km!

I'm stage 2 (94) with CAI on my 06 STI.

So yours seems normal!

Edit, if you want more specific info on STI's I highly recommend you go to www.iwsti.com!

Cheers,

Jay
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Old 01-19-2009, 11:05 AM   #11
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Quote:
Originally Posted by yoon89 View Post
I was wondering if I'm getting the right mileage out of my car.
So, I started recording my fuel economy on www.fuelly.com.

Being stock except 245mm wide tires, I could barely get about 350km out of a tank of gas. And the website converted to 19.0 MPG when I ran a full tank of gas with no boost the entire time.

Would you say this is common among stock STI's?

Thank you!
It's probably 19 MPG American, Canadian it would be 22.7. So that's not that bad... With my wrx I average 28 MPG Canadian, 23.4 MPG American... Or 480KMs when the low gaslight comes on.
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Old 01-19-2009, 12:38 PM   #12
yoon89
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I've been driving with no boost on 91 octane.
Each 1/4 of the tank is good for about 50 miles...lol
It's true that approximately 80% of my driving was in city as well.

I was wondering if having 94 octane will actually optimize the ignition timing to get better mileage. It's just that I use Esso card to get 3% extra discount, but they don't have 94.
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Old 01-19-2009, 01:18 PM   #13
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Quote:
Originally Posted by yoon89 View Post
I've been driving with no boost on 91 octane.
Each 1/4 of the tank is good for about 50 miles...lol
It's true that approximately 80% of my driving was in city as well.

I was wondering if having 94 octane will actually optimize the ignition timing to get better mileage. It's just that I use Esso card to get 3% extra discount, but they don't have 94.
Higher octanes actually gives you worst mileage.

19 mpg sounds okay for an STi, but do try to keep a better record of the fuel usage and the mileage. The I get XXX miles to the tank isn't very accurate.
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Old 01-19-2009, 02:14 PM   #14
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Quote:
Originally Posted by minifreak View Post
Higher octanes actually gives you worst mileage.

19 mpg sounds okay for an STi, but do try to keep a better record of the fuel usage and the mileage. The I get XXX miles to the tank isn't very accurate.
how does higher octane give worse mileage?
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Old 01-19-2009, 02:48 PM   #15
minifreak
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From what I understand about the octane is that the higher octanes are a slower burning mixture, where as the lower octanes are more volatile. This actually means the lower octane gas can produce slightly more power if everything else is kept the same.

http://wiki.answers.com/Q/Will_using...er-gallon_rate
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Old 01-19-2009, 02:52 PM   #16
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ah that wiki answer went from yes to no with everything in between.

I will say, lower octane vs higher octane is all in the tune. tuned for higher can net better mileage, only reason we don't see it is who tunes a car to run higher octane for anything but power.

better power can come from a better tune showing a more efficient car, gaining better mileage. thats my theory until proven incredibly wrong.
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Old 01-19-2009, 04:14 PM   #17
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Quote:
Originally Posted by Drakar View Post
ah that wiki answer went from yes to no with everything in between.

I will say, lower octane vs higher octane is all in the tune. tuned for higher can net better mileage, only reason we don't see it is who tunes a car to run higher octane for anything but power.

better power can come from a better tune showing a more efficient car, gaining better mileage. thats my theory until proven incredibly wrong.
Yeah, the answers aren't very consistent, but no where did it said you can get better mileage from higher octane. The most important line was the last answer:
Quote:
No, just the opposite. Lower octane fuels, say 87 pctane, have more hydrocarbons than higher octane fuels, say 91 octane, because the higher octane fuels have had non-hydrocarbon additives put in that reduce the capability to have the highest "burn" otherwise possible. The higher octanes are for cars with high compression engines and they are there to prevent knocking, which can damage the engine. This information is taken from the American Petroleum Institure website
I tuned my car to have good fuel economy (10~11km/L, 23.5 us MPG, 28.3 imp MPG mixed, and over 13km/L pure HWY.) I have seen as high as 14km/L on longer trips too. The extra power I got was just a bonus.
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Old 01-19-2009, 04:42 PM   #18
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well, actually the first answer to the question does, but I get your point.

mileage still is dependant on your right foot, mine is set to power!
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Old 01-19-2009, 05:22 PM   #19
jaydow11
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Quote:
Originally Posted by minifreak View Post
This actually means the lower octane gas can produce slightly more power if everything else is kept the same.

If that were actually true, every tuner in the world has been pulling our legs and 100oct race gas is the biggest conspiracy theory ever in the history of racing!
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Old 01-19-2009, 05:50 PM   #20
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Quote:
Originally Posted by jaydow11 View Post
If that were actually true, every tuner in the world has been pulling our legs and 100oct race gas is the biggest conspiracy theory ever in the history of racing!
Ah, but as I said before with everything else being the same (timing/fueling) lower octanes actual produces more power. By using high octane that means we can run more timing and whatnot to generate more power without knock and destroys the engine
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Old 01-19-2009, 06:07 PM   #21
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Quote:
Originally Posted by minifreak View Post
Ah, but as I said before with everything else being the same (timing/fueling) lower octanes actual produces more power. By using high octane that means we can run more timing and whatnot to generate more power without knock and destroys the engine
Yea, but... You CAN make more power with higher octane fuel then you can with lower octane fuel, and you can drive it with less gas pedal, thus possibly getting more MPG. Now if you actually use the extra power to go faster that's different. If you don't tune for it THEN yes, it's a waste and you won't gain anything...Either power or fuel mileage.
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Old 01-19-2009, 07:08 PM   #22
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try switching gas stations. I highly recommend putting in Chevron 92 instead.
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Old 01-20-2009, 06:28 PM   #23
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Quote:
Originally Posted by minifreak View Post
From what I understand about the octane is that the higher octanes are a slower burning mixture, where as the lower octanes are more volatile. This actually means the lower octane gas can produce slightly more power if everything else is kept the same.
It's been a while, but I looked for trends once before in all kinds of fuels, and did not find major generalizations, or immediate exceptions to every generalization I've seen regarding burn rate vs octane vs volatility vs other parameters.

Lower octane doesn't necessarily produce more power, it just so usually happens that our pump gases have a mixture of chemicals that often have a slightly lower energy per unit volume, and we measure gas mileage in volume (opposed to weight, where some substances that have a lower energy per unit volume can have higher energy per unit weight).
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Old 01-20-2009, 11:14 PM   #24
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Thank you very much everyone for your inputs!
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