Tesco unleaded Vs Shell Optimax

L8ERS · Post by **L8ERS** » Tue Sep 12, 2006 10:22 pm

Ok so I'm a bit late! But here is my bit anyway.

A quote from http://www.petrolprices.com/about-fuel.html follows;

Super Fuels

Many of the large petrol companies have launched 'super fuels' - petrols and diesels that have a higher research octane level. These fuels are said to increase power in many vehicles, deliver less pollution than regular fuels and help to maintain a cleaner engine. Tesco will soon be selling Super Unleaded 99 Octane petrol, supplied by Greenergy,the highest octane level petrol available in the UK.

Using Super Fuels

One of our users commented that using higher octane fuel than your engine requires actually gives no benefit and may be a waste of money. This is because virtually NO engines require 98 RON over 95, and the market for 'super' fuels seems to be based on people's misunderstanding of octane ratings and the placebo effect of filling up with 'more powerful' fuel - making motorists think their engine is running better in some way.

What do the fuel companies say then, to justify the "increased power" claims for the super grade fuels? Some companies say that while all fuels contain cleaning additives, 'super' fuels contain more or better detergents to keep the injectors cleaner than standard fuel. Others say the fuel is a few percent denser which gives slightly more power per litre. These benefits may be marginal though in comparison to the extra cost involved so it is worth ensuring that your engine will actually benefit before filling up.

Some engines actually do need higher octane fuel, such as race engines with very high compression and some supercharged engines, such as the import version of the Nissan Skyline. Also, a few vehicles, such as the new BMW K1200R motorbike, can sense knock and adjust their engine tuning to take advantage of higher grade fuels.

Brasco · Post by **Brasco** » Tue Sep 12, 2006 10:42 pm

Our Turbo's have a knock sensor. So higher octane is preferable.

dragon · Post by **dragon** » Wed Sep 13, 2006 12:13 pm

L8ERS wrote: Also, a few vehicles, such as the new BMW K1200R motorbike, can sense knock and adjust their engine tuning to take advantage of higher grade fuels.

A bit like the 480 then?

Also the T4, and the T5 both require/prefer 98 ron fuel, as designated on the sticker in the filler flap. Of course both my T5R and V70AWD have been remapped to only run on 98 ron fuel, so that basically dictates where my petrol comes from...

... Or rather did, until I LPG'd the AWD!

Ettore Bugatti · Post by **Ettore Bugatti** » Wed Oct 10, 2007 1:42 pm

Bump

http://www.thorneymotorsport.co.uk/tuni ... ults.shtml

muddyfox470 · Post by **muddyfox470** » Wed Oct 10, 2007 5:43 pm

Haha a bit of a bumpage, nice to see the cheap prices

When I was going around Europe where I could I would fill up with the higher octane fuel (for about 2 cents more per litre) and would notice a change almost immediately, even with a mixed tank.

It seemed to want to accelerate much more, and just seemed to be better mid range as well, i.e. over taking etc

Ian

Big Brother · Post by **Big Brother** » Wed Oct 10, 2007 6:38 pm

Hmm when I started this thread fuel was only 77p a litre

Never going to see that again!

Glad IÃ¢â‚¬â„¢m only paying 40p for mine

stu chacks · Post by **stu chacks** » Thu Oct 11, 2007 10:36 pm

volvo-bigbrother wrote:
Glad IÃ¢â‚¬â„¢m only paying 40p for mine

You really should stop using that garden hose and jerrycan Ad, gonna get caught one of these days amigo!

Stu.

Big Brother · Post by **Big Brother** » Fri Oct 12, 2007 7:33 am

stu chacks wrote:
volvo-bigbrother wrote:
Glad IÃ¢â‚¬â„¢m only paying 40p for mine
You really should stop using that garden hose and jerrycan Ad, gonna get caught one of these days amigo!

Stu.

Caught? Na