95 ron

[car.crash]

One more thing to add. People mention old contaminated fuel tanks at petrol stations and rust going into your tank etc.
Well I recently removed the fuel tank on my 20 year old gt turbo and low and behold it was mint with no rust, pubes or infact and other kind of aids.
It also ran much better on leaded fuel

 

[LEE69]

Closest v-power is a 10mile slow 30mph trip

 

[Wolvo-Oleg]

I'm happy to run both vpower and momentum in mine, anything else I feel my bumhole start to twitch.

As for Bret chilling, I disagree man, I admire his dedication to be honest

 

[Jason-R]

Yep when you have spent the sort of money he obviously has I would be sticking v power in too. Everyones situation is different though

 

[Seal_LCR]

Tesco and bp by me but always use tesco as its 99 and about 5p cheaper!

 

[Seal_LCR]

Yep when you have spent the sort of money he obviously has I would be sticking v power in too. Everyones situation is different though

I agree with this

Not that this sinking in be 98+ is cheaper in the long run

 

[Jason-R]

I think its more the driving around looking for a specific petrol station than the actual fuel cost tbh. Reminds me when I used to stick 10 quid at a time in my M3 as it made me feel better about getting 9 mpg. Still hurts my pocket now and that was 8 years ago!

 

[Seal_LCR]

I think its more the driving around looking for a specific petrol station than the actual fuel cost tbh. Reminds me when I used to stick 10 quid at a time in my M3 as it made me feel better about getting 9 mpg. Still hurts my pocket now and that was 8 years ago!

The OP was and 6pages later 95 has been forgotten (ish)

 

[mty12345]

I'm with mutley and dolby on this one. Like mutley pointed out, yes your knock sensors will adjust the maps for the 95 but only once they DETECT knock! They aren't psychic, they can't see into the future and go "oh yeah it's going to knock in a min so i'll retard the timing now"! They detect knock as and when it happens and every time they do detect it then the engine is being damaged by it happening!
Also the map doesn't stay at 95 settings until you next put fuel in, (the ecu doesn't know when you fill up) it constantly tries to readvance the timing back to the 98 settings until detecting knock again and so on, and so on! For me any knock is to much knock, and for that reason i only use v-power!

 

[DOLBY]

My mate had a remapped LCR and he always put 95 in, and he couldnt/wouldnt believe the truth. Especially the fact he was getting crappy mpg.

Jeez the guy floored the car evrywhere, i mean i dont think he ever 'pottered about'. Mind you he only had it for 6 weeks, but flooring it constantly when the car was setup for 98???? Crikey

 

[brotjs]

95 will be fine, however I dare say that you may be sacrificing more money by using cheaper fuel, I own a bocanegra and although 98 is more expensive, I seem to get far more MPG when taking it steady and a good bit more power when I need it. I think the costs balance out to be honest, therefore I use 98 just to be nice to my engine! lol

 

[Seal_LCR]

If you are getting far more mpg on 98 read my figures as you will find 98 works out cheaper!!!!

 

[Seal_LCR]

I didn't wanna get involved in this thread but I am gonna put some costs in

I fill up with 99 Ron (tesco) yes you can high 5 me if you like!!

53 litres usually costs £75 @ 139.9 and I get 320 miles ish

53 litres Usually costs £71.47 @ 134.9 and I get 280ish

So per litre in 99 it would do 6.1 miles
Per litre in 95 it does 5.3 litres

So for 95 Ron to do the same amount of miles as I get on 99 I would have to used 60 litres @ a cost of £81.44

This is based on my Leon so others may be different

Read

 

[Seal_LCR]

Look at is this way with the price difference you only need to do 13.1miles more on vpower for it to work out the same miles per pound as 95ron (using my figures that is) so why bother I just don't see the point? (aimed not directly at you but to the whole thread)

Now can everyone stay on topic..........ummmmm topics

And this

They related to the LCR but theory is the same

 

[mty12345]

"However, burning fuel with a lower octane rating than that for which the engine is designed often results in a reduction of power output and efficiency. Many modern engines are equipped with a knock sensor (a small piezoelectric microphone), which sends a signal to the engine control unit, which in turn retards the ignition timing when detonation is detected. Retarding the ignition timing reduces the tendency of the fuel-air mixture to detonate, but also reduces power output and fuel efficiency. Because of this, under conditions of high load and high temperature, a given engine may have a more consistent power output with a higher octane fuel, as such fuels are less prone to detonation"

And this,
That's why you get the better mpg on 98

 

[Muttley]

As far as I know (and I haven't been able to find a lot of detail yet) it's not simply a matter of retarding the ignition, the ECU shifts to a different map which also enriches the mixture - you need to do both to inhibit detonation, the richer mixture cools the charge more. Other measures it might take to cool the charge include opening the EGR valve further. All of these reduce power and increase consumption.

 

[alias]

Using 95 or any other lower octane fuel than recommended isn't a ploy by manufacturers, but simply saving your engine! Lower octane fuel won't burn as completely in an engine designed for higher performance. As a result, coke deposits will build up (especially on the spark plug cathodes) which will on a high load drive retain heat and glow red hot. This can pre-ignite the fuel and result in multiple pressure waves (which is also what produces the characteristic 'knock') within the engine, destroying the nitrogen layer between the burning fuel and piston crown that exists in normal conditions. With no nitrogen layer, the burning fuel hits the piston and blows a hole in it in moments.

This is all over a large distance (thousands of miles), but I still wouldn't recommend 95 unless you have no option or it is occasional. As for adding octane boosters, I don't know. It may negate the low burning temperatures (relatively) but I don't honestly know.

My 5 cents? Don't do it man!

Source: I work for Ford at their UK R&D facility

 

[Sinbad]

The lower the octane the more volatile the fuel. Would something more volatile burn less completely?

 

[Seal_LCR]

So if you read all the supporting arguments you will see 95 will ignition and blow up your car into a thousand pieces catch fire and you will die! THE END

Use 98! 98 saves lives!

 

[Sinbad]

So if you read all the supporting arguments you will see 95 will ignition and blow up your car into a thousand pieces catch fire and you will die! THE END

Use 98! 98 saves lives!

Heh. I wish I could. 95 handicaps my car so badly.