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what type of gas should i use?

TornadoFast09

Go Kart Champion
Location
Delray Beach, FL
Ride
MkV GTI
How much of a difference does it really make? I always have put 93 in my car, but if gas goes up to $4 a gallon I'll have to start putting the regular in the car--I'm 17 and don't want to spend all my money on gas. I only drive like 300 miles a month or so, most of it in town. Bone stock 2009 GTI.

Clark
only 300?! thats nuts! im 17 and i do like 1800 a month lol and i dont even commute anywhere
 

Kleyman

New member
Location
Florida
Ride
2008 GTI MKV
Don't be cheap use 93...My ecu flash is for 93 octane...get the stage 1 ECU flash from APR 93 octane and then you will have a sure reason to fill up with 93
 

The Fed

Old Guys Rule
Location
Florida
Think about it, if a tune that adds 50 HP and 100 ft.lbs. of torque requires 93 octane, why would anyone here think 93 octane is necessary for a stock car? I hope there's someone with a brain here. Regular is fine if you're stock. It won't hurt anything and you'll save 20 cents per gallon. The small performance decrease won't be noticed. Do a dozen 1/4 mile runs with regular and a dozen with 93 octane. Let's see the time slips. This is all propaganda from the oil and gas station industry designed to seperate you from your money. Don't fall for it.
 

DarkX

Your Boss :P
Location
In a room with the door locked :P
Ride
GTI ED30 DSG
DarkX, you've been giving some incorrect info down the line somewhere. Your manual may specify 98 RON, but ours specifies 91 PON, which is NOT the equivalent of 98 RON.
My info is correct. I never said 98 RON is 91 PON/AKI where did you read that? 98 RON is 93 PON/AKI. And 95 RON is 91 PON/AKI. As well as 100 RON which is what I use after my dealer's recommendation is 95 PON/AKI. My tank cap has this sticker inside which says 98 RON as minimum. Similarly to the sticker below:

Fuel flap label for a US Mk5 2.0t FSI (BPY) engine, should be the same as the OP's 2007 US GTI


->Quoted:

Octane Rating Calculation Methods
There are various calculation methods, RON, MON, and PON or AKI.

RON: (Research Octane Number). Most common fuel used in Europe, Australia and some other Countries.
It is determined with measurements of fuel behavior in a variable compression engine.
Results are compared with other iso-octane fuels, which means,
compared with other fuel types with equal number of similar octane molecules present,
but not the of the same organic compound.

MON: (Motor Octane Number). Determined also with a variable compression engine,
but with the fuel already preheated, variable ignition timing and higher RPMs than the RON method.
This method is more precise on determining fuel behavior on an loaded engine.

PON or AKI: (Pump Octane Rating or Anti-Knock Index): This is the method used in USA and Canada,
expressed as [R+M]/2, which means RON number plus MON number, divided by 2.
In other words, it is the average between both methods above.
Equivalency
So, due to the fact that RON is always from 4 to 5 points higher of its equivalent to PON or AKI,
the number conversion between USA and Europe octane ratings will approximately be as follows:
USA (PON) –> Europe (RON)
87 –> 91
89 –> 93
91 –> 95
93 –> 98
Thanks. :thumbsup:
Btw, 95 RON is the minimum you can find here, there is no 93 or 91. Also 99% of gas stations also have 100. So it's practically impossible not to find what I need, fortunately. Unfortunately though it's awfully expensive.
 
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VancouverGTI

Go Kart Champion
Location
Vancouver
Yes, henwee, there should be. :wink: And it is marked in both PON and RON :wink:

Fuel flap label for a US Mk5 2.0t FSI (BPY) engine, should be the same as the OP's 2007 US GTI
Thanks JetTurbo! :thumbsup:

No worries DarkX. There was simply the implication that because your car runs 98, that an American's should run 93. My point was simply that that isn't the case.
 

DarkX

Your Boss :P
Location
In a room with the door locked :P
Ride
GTI ED30 DSG
Thanks JetTurbo! :thumbsup:

No worries DarkX. There was simply the implication that because your car runs 98, that an American's should run 93. My point was simply that that isn't the case.
It's all good. :thumbsup: I still believe though that it's best to use something just a little better than the minimum. If the minimum required is 91 PON/AKI then I would advise for 93. Just for peace of mind that's all, plus the extra horsepower. That's why my dealer recommended to use 100 RON instead of 98 which is the required for my car. They specifically told me so the day I bought the car. Now if gas price is a restriction then that's another thing.
 

Vladimir

Easy rider
Location
europe
Ride
4 motion
I use only 100 oct gas...Standard 08 FSI GTI with ecu reflash.
The sticker on the fuel cap/cover states "minimum 95 octane"
 

dragoncoach

Ready to race!
Location
SF Bay Area
How much of a difference does it really make? I always have put 93 in my car, but if gas goes up to $4 a gallon I'll have to start putting the regular in the car--I'm 17 and don't want to spend all my money on gas. I only drive like 300 miles a month or so, most of it in town. Bone stock 2009 GTI.

Clark
So in 300 miles, you use, maybe, 12 gallons. At .15 a gallon, it will cost you $1.80 more a month! Are you are willing to use cheap gas which will affect performance and possibly damage your engine over $1.80? If you can't afford it, you should have bought a Honda which runs on any grade gas. btw, we use 91 Chevron or Shell.
 

VancouverGTI

Go Kart Champion
Location
Vancouver
It's all good. :thumbsup: I still believe though that it's best to use something just a little better than the minimum. If the minimum required is 91 PON/AKI then I would advise for 93. Just for peace of mind that's all, plus the extra horsepower. That's why my dealer recommended to use 100 RON instead of 98 which is the required for my car. They specifically told me so the day I bought the car. Now if gas price is a restriction then that's another thing.
Nothing wrong with a little peace of mind, I agree. Gas prices are on peoples' minds nowadays, for sure... kind of surprised it's not more of a restriction for you than for us, honestly!

Personally, I'd love to know how much horsepower is to be had from running more octane than, "required". I suspect it's not much, but don't have any 91 vs. 93 octane dyno runs to back that up.

At the very least, I'd be more inclined to run higher octane in the summer when air temps and pre-ignition potential are higher as well. As you say, cheap insurance! :thumbsup:
 

DarkX

Your Boss :P
Location
In a room with the door locked :P
Ride
GTI ED30 DSG
Well since I haven't used anything other than 100 RON since my very first refill for 3 years now, I'm not in the position to tell the difference. I can only tell you what my dealer said when I asked them about power gains over regular unleaded (95 RON). They said, for my car, around 25bhp. If that number is too generous I dunno, the reason I've been using 100 RON has to do with reliability issues so whether I gain 10, 15 or 25bhp is of no interest to me. Together with my excellent oil, car's been running smooth as silk and that's all I care about.

Now gas prices are very high here as you know. Our government has been sticking it in our butts lately. Our 100 RON costs around 1.8 euro per liter. Really expensive I know. Here's the thing though; regular unleaded (95) is only about 40 cents cheaper while super unleaded (98) is somewhere in the middle. So the price difference just doesn't justify taking any risks - not that I would take any risks after having spent 39,000 euro to purchase a car, regardless of fuel price. But even for someone that might be willing to take the risk, I don't think that 20 cents per liter (x 55 liters for a full tank = 11 euro) of difference would be enough of a motive.
 

1972vw

Ready to race!
Location
Lexington, KY
Ride
'09 GTI
only 300?! thats nuts! im 17 and i do like 1800 a month lol and i dont even commute anywhere
Well to drive to school for me is all of like 3.5 miles, other than that it's just to and from church twice a week which is maybe 5 miles, if that. I do other stuff but it's all within the 10 mile range.

dragoncoach said:
So in 300 miles, you use, maybe, 12 gallons. At .15 a gallon, it will cost you $1.80 more a month! Are you are willing to use cheap gas which will affect performance and possibly damage your engine over $1.80? If you can't afford it, you should have bought a Honda which runs on any grade gas. btw, we use 91 Chevron or Shell.
You have a point...I'll keep using the 93. As far as gas stations go...we don't have a Chevron, and the local Shell is known to have water in the gas, so I go to the BP. Haven't really noticed a difference between any of them, but I don't drive my car very hard.
 

vagike

Newbie
Location
Edmonton
93 octane can vary from pump to pump, station to station.

Some refineries will blend ethanol in with 93 octane, others do not.

Also, each refinery blends 87, 89, 91, 92, 93, 94 differently because they each use different processes, and different blending stocks.
 

richard.alvarez2

07 White Rabbit
Location
nor cal
Ride
2007 rabbit 2dr hbck
hey, im new to gti's and i just purchased a 2007 mkv, but im not entirely sure what type of fuel to use. i did some researching and i got the sense that i should use 91 or 93, but im not sure and i still have a week before i pick up the car. any tips? thanks.
use what it says on the gas door, i got my 2007 rabbit at 94k and got 125k now, i average 320miles per tank regardless of the kind i use. hope it helps
 
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