Does buying the more expensive fuel actually make a difference? - Page 3

Will · 13-12-2006, 13:32

Quote:

Originally Posted by Rotty

]

I think he was referring to 95/97 Ron petrol

The supermarkets buy it on the Rotterdam spot market, so you could quite easily be getting Shell fuel from asda ( 95 )

Ah in that case I agree.

mejinks · 13-12-2006, 16:18

I replied to Wills post above, but like several replies today it has disappeared?

Will · 13-12-2006, 16:21

Quote:

Originally Posted by mejinks

I replied to Wills post above, but like several replies today it has disappeared?

I'll ask Daz about that. Seems weird.

Feek · 14-12-2006, 15:12

So do I, or don't I on my 2000 Focus?

Grandad · 14-12-2006, 15:18

Quote:

Originally Posted by Feek

So do I, or don't I on my 2000 Focus?

No , not at all

Will · 14-12-2006, 15:33

Quote:

Originally Posted by Rotty

No , not at all

Seconded.

Von Smallhausen · 14-12-2006, 22:49

It does.

If I put normal unleaded in the MR2 and cane it, the engine will go bang. I have put a small amount in before when I have ran low but I drive it very carefully until I can fill it up.

The higher RON value is what the engine and ECU are mapped for and higher grade petrol is a must.

Gaijin · 21-12-2006, 02:42

Might as well start contributing on day one

As stated, higher octane (RON) fuel is only really advantageous if your ECU is capable of advancing the ignition on your engine to benefit from it.

Particularly in turbocharged engines where the higher charge temperatures due to the immense heat generated by the turbocharger (being driven by exhaust gases and spinning at up to 150,000rpm), can cause the fuel to pre-ignite or detonate (det) before the spark plug sparks, which can damage the engine, as the explosion is not occurring at the correct time.

Higher octane fuel is more resistant to detonation, and therefore an engine using it can be run at more lairy timings. Some cars like the Mitsubishi Evolution 1-9 HAVE to be run on 97RON plus to avoid det due to the engine mapping.

So unless you have a high rpm (VTEC etc) or perfomance N/A engine or a F/I engine - keep your wallet in your pocket

Its also worth pointing out that Tesco 99RON is not properly refined fuel, its just 95RON with a truckload of ethanol in it to increase the RON. There are reports that on some cars, prolonged use of ethanol additive fuel can rot fuel lines and/or components.

Shell V-Power is, on the other hand properly refined 99RON fuel

14-12-2006, 15:12	#24
Feek ex SAS Join Date: Jun 2006 Location: JO01ou Posts: 10,062	So do I, or don't I on my 2000 Focus? __________________

14-12-2006, 22:49	#27
Von Smallhausen I'm Free Join Date: Jun 2006 Location: Tyneside Posts: 3,061	It does. If I put normal unleaded in the MR2 and cane it, the engine will go bang. I have put a small amount in before when I have ran low but I drive it very carefully until I can fill it up. The higher RON value is what the engine and ECU are mapped for and higher grade petrol is a must. __________________ " Well, old bean, life is really so bloody awful that I feel it’s my absolute duty to be chirpy and try and make everybody else happy too." David Niven, 1910-1983.

21-12-2006, 02:42	#28
Gaijin Columbian Coffee Join Date: Dec 2006 Posts: 99	Might as well start contributing on day one As stated, higher octane (RON) fuel is only really advantageous if your ECU is capable of advancing the ignition on your engine to benefit from it. Particularly in turbocharged engines where the higher charge temperatures due to the immense heat generated by the turbocharger (being driven by exhaust gases and spinning at up to 150,000rpm), can cause the fuel to pre-ignite or detonate (det) before the spark plug sparks, which can damage the engine, as the explosion is not occurring at the correct time. Higher octane fuel is more resistant to detonation, and therefore an engine using it can be run at more lairy timings. Some cars like the Mitsubishi Evolution 1-9 HAVE to be run on 97RON plus to avoid det due to the engine mapping. So unless you have a high rpm (VTEC etc) or perfomance N/A engine or a F/I engine - keep your wallet in your pocket Its also worth pointing out that Tesco 99RON is not properly refined fuel, its just 95RON with a truckload of ethanol in it to increase the RON. There are reports that on some cars, prolonged use of ethanol additive fuel can rot fuel lines and/or components. Shell V-Power is, on the other hand properly refined 99RON fuel Last edited by Gaijin; 21-12-2006 at 02:47.