Super or regular?

[Wurzel]

Forgot to fill up so had to use the Shell on the way to work this morning. 1.11.9

Stuck in 15 quid and will be using the Tesco later this evening, its always MUCH cheaper.

Really? Here Shell are about the cheapest. I don't use Tesco because I don't like their business practices.

[AlanD]

Yeah, I recon the Tesco will be about 108 / 109 tonight when I fill the rest of her up.

[keelaw]

Yeah, I recon the Tesco will be about 108 / 109 tonight when I fill the rest of her up.

Ok so you'll be saving about 3p per litre. Even with a full 55 litre fill up, that's only 1.65.

Driving around to find the cheapest station will reduce these small savings even further (though the drive will/ should be fun!)

[AlanD]

Thats a pint in Weatherspoons

[Rolfe]

I filled my Peugeot up yesterday, and actually took note of what I was doing for the first time.

Esso garage.  £1.02.9 per litre for 95 RON.  The only other grade they had was 97 RON, at £1.08.9.  So about £3.60 extra for a tankful, and you guys are saying the 97 isn't worth it anyway.

Given that the Mk VI is explicitly stated to require "at least" 95 RON, have we decided whether there's any actual benefit to putting in 98 RON, and if so what is the benefit and how often should we do it?

Rolfe.

[AlanD]

^ Oh no ! Not again

[jaydubveedub]

I have tried running my MK5 on 97RON and didn't notice any difference to when I ran it on 95. However, if I put Tesco 99 in or Shell V Power it is noticeably better.

My advice would be to run it on 99RON all the time.

[Rolfe]

^ Oh no ! Not again

Well, where is there an actual answer to this?

My advice would be to run it on 99RON all the time.

Why?

Rolfe.

[AlanD]

How many times? Because it has more octane in it which the FSI engine is designed to run on (runs for longer in FSI mode, this has all been said and I cant be assed to find the link). It has cleaning agents in which help keep your engine cleaner, thus more efficient. You get more MPG. Your meant to get more power (all be not much) etc etc etc. You just have to decide if you want to spend that bit more on your fuel or not, it will run perfectly well on 95.

Sorry, Im a bit ratty as its a million degrees in my office.

[AudiA8Quattro]

Like all older gti's/vr6's with electronic fuel injection systems, they are set up to run on 98 RON, but will run perfectly on 95 RON with knock control.
Obviously using 95 RON can lead to a small loss of power. The higher the RON figure, the better the fuel can resist detonation, hence being able to advance the ignition timing.
Is this correct?