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Old 10-09-2009, 06:29 PM   #1
tfcGTI
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GTI Fuel Requirements

Greetings:

I am new and I will be buying a 2010 Carbon Steel 4 door, manual GTI in a couple of months. I am wondering what type of fuel is required? The sales guy says premium is recommended but not required. Is this true and if so what are the consequences of using regular 87 octane?

Thank you.
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Old 10-09-2009, 10:40 PM   #2
GlutenBoy
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Good question. When I had my Jetta Wolfsburg 1.8T I always put premium into it, but I always wondered if it was about fact or fear.
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Old 10-10-2009, 01:25 AM   #3
Stein357
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The ECU will retard the timing of the ignition and you will see a slight decrease in performance and fuel mileage.
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Old 10-10-2009, 10:16 AM   #4
s2kguy
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Auto dealers who have their own pumps generally have 87 octane only. I know the launch GTI I drove had 87 octane in it and it felt strong with no pinging noticed. Having said that, I try to fill my car that requires 91 octane with premium (93) and refill when I'm down to 1/2 tank with plus (89) to keep it about 91.
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Old 10-10-2009, 05:27 PM   #5
dthomas53
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Damn, for whatever reason this never occurred to me. What if I only fill up with regular? Will this degrade my engine over time? I'm not too worried about a little HP loss, but I don't want to get the car and kill it.

Any info is appreciated.
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Old 10-10-2009, 07:27 PM   #6
mongo
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I'm willing to spend the $2 a fill-up to not find out. Premium all the way for me.
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Old 10-10-2009, 11:58 PM   #7
GlutenBoy
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That was pretty much my philosophy I had with my Wolfsburg and I don't think it will change with my new GTI.
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Old 10-11-2009, 10:20 AM   #8
volsfan0911
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I'd stay with premium as much as possible personally. The price spead isn't that much and you will get better performance. I take that as "87 is OK if needed". Here in the US, you will find at least 91 octane almost everywhere. The only scenario I've ever run into where it wasn't available was border towns in Texas and a couple of trips down to Mexico (Pemex can do whatever they please as they're a state-owned monopoly essentially). Modern knock sensors and ECU are wonderful but there's a limit and I'd question whether 87 octane is going to be OK long run in the GTI's motor.
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Old 10-12-2009, 02:13 PM   #9
fokker
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Engine is designed to be used with high octane fuel to allow for higher compression. However, if regular fuel is used, the ECU will retard the timing so as to not damage the engine.

So, feel free to use regular if you like -- but you're gonna have less power and more fuel consumption than with premium fuel.
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Old 10-13-2009, 03:52 PM   #10
koolgreen
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now how does the engine know it is low octane gas?
or is it just that it will adjust timing as it starts pinging creating stresses in the cylinders?
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Last edited by koolgreen; 05-16-2011 at 12:25 PM.
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Old 10-13-2009, 05:09 PM   #11
bubuski
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Quote:
Originally Posted by koolgreen View Post
now how does the engine know it is low octane gas?
or is it just that it will adjust timing as it starts pinging creating stresses in the cylinders?

It is the knock sensor's job to know the gas octane rating. See definition below.

Quote:
Originally Posted by answers.com
It allows the engine to run with the ignition timing as far advanced as possible. The computer will continue to advance the timing until the knock sensor detects pinging. At that point the computer retards the ignition timing just enough for the pinging to stop.
A knock sensor assures that you're getting as much power and fuel economy as is possible from your engine
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Old 10-18-2009, 12:11 AM   #12
krische
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Honestly, using regular gasoline will give you less performance. Which means your mileage will likely decrease. Thus, negating any benefit of buying the cheaper gas.
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Old 11-05-2009, 07:23 PM   #13
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Originally Posted by krische View Post
Honestly, using regular gasoline will give you less performance. Which means your mileage will likely decrease. Thus, negating any benefit of buying the cheaper gas.
Speaks the Truth.
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Old 11-05-2009, 08:34 PM   #14
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Wink

Quote:
Originally Posted by grada89 View Post
Speaks the Truth.


Fudge:

likely "negating"....


tino
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Old 11-05-2009, 08:53 PM   #15
mr gee
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I would stick to the recommended fuel grade or better. Afet all, you did not buy a GTI and degrade it with low octane fuel. The ability to run such fuel is basically to enable you to continue to drive but with some performance compromise should the servo had no premuim fuel on hand.
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Old 11-05-2009, 09:01 PM   #16
tfcGTI
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Thanks for all the great comments. Nothing but the best fuel will do which leads to a follow-up question. What is a top tier fuel?
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Old 11-06-2009, 12:01 PM   #17
fokker
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Top tier is a standard. If a gas company can meet certain requirements, they are allowed to call their gas top tier:

http://www.toptiergas.com/

http://en.wikipedia.org/wiki/Top_Tie...rgent_Gasoline

Last edited by fokker; 11-06-2009 at 12:11 PM.
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Old 11-06-2009, 12:40 PM   #18
krische
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Quote:
Originally Posted by fokker View Post
Top tier is a standard. If a gas company can meet certain requirements, they are allowed to call their gas top tier:

http://www.toptiergas.com/

http://en.wikipedia.org/wiki/Top_Tie...rgent_Gasoline
No BP on that list?

Eh, I always use BP since I have the Chase BP card and that gets me 5% back.
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Old 11-06-2009, 12:57 PM   #19
wholesome
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I'm putting in 89oct on my new GTi and consuming about 17.9mpg.

Is it me or does this car really eats that much gas? I honestly don't push my car at all, reving only to about 3k and leaving it on 6th gear when im up to speed, still.... "breaking the car in".
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Old 11-07-2009, 11:47 AM   #20
thekinger
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i know i'm not driving a mk6 gti yet, but the manual on my jetta gt said it should have premium. i very rarely, if ever put even plus in the car and i have almost 200k on the motor. the valves and rings and pistons seem to be in perfect shape. there is absolutely no oil being burned and plenty of pull left in the motor. i never really pushed the motor, 'cause i've always tried to get every mile i could out of a motor and i used to get low to mid-thirties in mph with just 87. just my $0.02
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