T8/T6 owners and fuel octane rating

[yeoman]

Would love to know what UK drivers of T6/T8 owners are doing regarding fueling up.
Has anyone gone for standard fuel ?

I am waiting on my T8 and from my elementary knowledge of physics and mechanics, feel that the higher octane rated fuels would be the way to go, especially with an engine that is both super and turbo-charged.

Would like to know what owners out there are doing and if they have noticed any difference in performance and MPG between standard and premium fuels.

Cheers.

[Lexman8]

In most modern cars the engine management system is set to run the engine optimally with the octane rating specified by the car manufacturer and there is little or no performance benefit in using a higher octane fuel. One exception might be if you like to thrash the hell out of your engine in which case there may be a slight advantage.

However, it is generally agreed that the additional cleaning/lubricating additives in premium fuels (eg Shell Nitro, BP Ultimate) can be of benefit.

[Philip Fisher]

Im using normal fuel. 25mpg on first fill up. 22.5mpg on second fill up. Not charged car yet as charger not ready. Tiny tank. Many trips to the filling station......

[PorkaFly]

The manual says:
- 95 RON can be used for normal driving.
- 98 RON is recommended for optimum performance and minimum fuel consumption.

So far I've had two tanks of 95 and filled-up tonight with Vpower (99) after rolling onto forecourt empty and in pure mode.

I'm now mostly commuting on Electric (charging at home and business), power mode for joining dual carriageways, and on an average of 27mpg after 750miles. 250miles out of a 50ltr tank really isn't that good...the same size tank in a Golf GTD will do 500miles

PF

[yeoman]

Originally Posted by PorkaFly

The manual says:
- 95 RON can be used for normal driving.
- 98 RON is recommended for optimum performance and minimum fuel consumption.

So far I've had two tanks of 95 and filled-up tonight with Vpower (99) after rolling onto forecourt empty and in pure mode.

I'm now mostly commuting on Electric (charging at home and business), power mode for joining dual carriageways, and on an average of 27mpg after 750miles. 250miles out of a 50ltr tank really isn't that good...the same size tank in a Golf GTD will do 500miles

PF

From some research I have done,it does appear there are some benefits in MPG from using higher octane fuel, whether that the price differential makes it worthwhile is another matter.

Also, it appears Tesco's momentum (99) fuel might be better than some of the better known brands

http://d16vpkeamxept2.cloudfront.net...fece4a1a23.pdf

[Jelmok]

I'm averaging 31.2 mpg having done just about 800 miles now. I charge whenever I can (at least once a day) and have used regular 95 Octane fuel only. Been a real mix of driving - quite a few long motorway journeys but a lot of school runs and town driving in pure mode too. Must admit I love the car. Loads of space - already done a few trips to Ikea and very comfortable on air suspension. Thing is fast in power mode too!

[Lexman8]

I've measured the fuel consumption on both my cars using the brim to brim method over several fill-ups (for accuracy) to compare normal and premium fuels. One car is a 2.2 litre diesel Honda and the other is a 5.0 litre V8 petrol Merc.

There was no discernible difference in fuel consumption or performance in either car. Apart from anything, I think there are too many variables (length of journeys, ambient temperature, number of passengers, traffic, etc) to say for certain one way or the other. I am fairly sure however that any improvement in mpg from premium fuel would be more than offset by the increased cost.

I now use normal fuel in both cars but add a 50ml dose of Millers every other fill up to provide enhanced cleaning/lubrication. Is this really necessary? Possibly not but as I often fill up with supermarket fuel it's cheap 'insurance'.

[Mezza]

Originally Posted by yeoman

From some research I have done,it does appear there are some benefits in MPG from using higher octane fuel, whether that the price differential makes it worthwhile is another matter.

Also, it appears Tesco's momentum (99) fuel might be better than some of the better known brands

http://d16vpkeamxept2.cloudfront.net...fece4a1a23.pdf

Are you sure you should be posting a report marked 'client confidential' on the internet??? Unless you are the client of course!

[yeoman]

Originally Posted by Mezza

Are you sure you should be posting a report marked 'client confidential' on the internet??? Unless you are the client of course!

Haha.

I have no shares in Tesco and none of my relatives does( as far as I know).

It is true I do shop there, but surely you cannot hold that against me , can you?

[apocz]

Does anybody remember that episode of 5th gear in which it turned out that the more performance tuned an engine is, the more gain you will get from high octane fuel. (ref. Subaru Impreza STI)

Will try the 102 octane when I'm in Germany in a couple of weeks and let you know if significantly different performance/economy.