What petrol do you fill the GTI tank with?

[Hawaii-Five-O]

Good video about "Everything to know about Octane and premium fuel" on youtube
Will your car be able to take advantage of it?
https://www.youtube.com/watch?v=D9nhXNarFdg

Brilliant video. Explains RON and octane in detail. If after watching this you still put super unleaded in your car – you have a screw loose

[Tornado8]

I just saw the vid-very interesting. It will be worth it for my GTI, because he said that if the timing is advanced on a re-map the it is worth putting in the higher octane fuel. I am waiting for the stage 2 maps to be released so it would be worth it I think. Any opinions

[Brenbo]

I use Tesco Momentum 99 octane on my GTI.  From my personal experience it does make a difference.  I have used both standard unleaded  95 octane and super unleaded 99 octane in separate Civic Type-R cars from new and found the 95 octane made the engine sound tinny and raspy after a few months from new.  Where as the 99 Octane on same spec car (my next Civic Type-R) from new left my engine sounding clean and new right up to when I traded it in 4 years later.  The increase in economy is probably so marginal it is hardly noticeable, but the increase in performance is a bit more noticeable.  The car on Super Unleaded did feel a bit more perky with better acceleration like it was sparking quicker.  Cannot vouch for the GTI yet, but what I can say is the Type-R's also stated to fill up with standard unleaded 95 octane.  But why eat cod if you can afford Salmon. 

[remlapeel]

Fifth gear have also done a comparison test of 5 fuels with a mk6 golf gti and the video showed the higher octane gave higher bhp.  Only 6bhp but still worth it with a remap and a cold air intake ill take the extra 6bhp

[monkeyhanger]

Or you could say "why feed the cat salmon when it prefers tuna". The Civic may well have been optimised for RON98 but fully capable of running 95 "as a minimum". Plenty of VWs around the era of the MK5 Golf were able to utilise 97/98/99 and run on 95 as a minimum. 97/98/99 in a GTI is a waste - you're igniting it earlier than intended if the timing is optimised for 95, although it'll do no harm.

Putting 95 in a car optimised for 98 is worse, potentially causing pinking (worst case cracking piston crowns - as commonly seen on the 1.4TSI twin charge engine when it was optimised for higher RON) if the car doesn't properly adapt the timing to suit 95 when it's being used.

[mk7gti]

I've been driving Golfs and Sciroccos for the last 10 years and the manuals used to always say 98 Ron will help with economy and performance. The GTI manual says exactly the opposite. I trust VW to make the call 95 all the way.

[herbie911]

Sadly my Golf R takes 98RON only.

However, my mk 6 Golf GTI throttle response definitely better with Tesco superunleaded. The car sounds different as well. Bp normal unleaded is quite decent but expensive.

I think it makes a bigger difference with the batch of petrol and how long the petrol been stored underground. That's why the car always feel better with a new full tank. Nowadays, I ask my friends who work at the station to text me when the petrol tanker had delivered them a new batch of superunleaded!

[mikeok]

Momentum 99 or v.power...evrery time.

[GiT1984]

I would be very surprised if the car is "optimised" for 95 Octane - I think VW only state that's the minimum!

With a modern, learning ECU, a turbo and direct injection (as well as indirect) - I'm surprised that anyone would say it's a fact that it makes no difference when nobody has tested it. I know that some people can't pick up on the subtle changes, but as most ECU's retard the ignition on poor quality fuel (to avoid pinking), then logic says that it can advance it too (as well as altering the boost levels)?

Most of my higher performance cars have demanded 98 Octane as a minimum and I remember my tweaked STi running like a bag of nails on 95 Octane, the one time I couldn't get any of "the good stuff" ....

My GTi has been run on high octane juice from day 1 - mostly on V-Power; but the couple of times I've put a whole tank of Tesco Momentum 99 in it - the note deepens and it feels perkier at low rpm and smoother at high rpm. All subjective but it appears I'm not the only one to have experienced this .....

[Bow237]

I use both, depends how much cash I have at the time lol