Hmmmm. Kinda been through this many times & unfortunately @Alex-W there isn't definite answer theoretically, higher octane fuel will increase fuel efficiency, science says it has to in addition, better fuel will increase power & therein lies the problem.

 

Had Fn Mother Theresa herself brought a vRS & then put higher octane fuel in it, she'd use the throttle more to see whether she could feel the increase in power, that is just human nature.

 

Problem occurs, that your bum dyno won't detect what could be a 2-3% increase in power but, after a tankfull you might comment it ran smoother personally, I think you'd have more chance of noticing an increase if you stepped upto Tesco's Momentum. 

 

What I know for certain is, that the team dynamics software will detect the difference in power on the JKM rolling road later next month & yes Momentum produces 1% more power than V Power nitro. It's also possible cheaper to Redex your car once in a while than use V Power as it's something like 5-7ppl more expensive 

Edited 26 January, 20206 yr by themanwithnoaim

27 minutes ago, themanwithnoaim said:

Hmmmm. Kinda been through this many times & unfortunately @Alex-W there isn't definite answer theoretically, higher octane fuel will increase fuel efficiency, science says it has to in addition, better fuel will increase power & therein lies the problem.

 

Had Fn Mother Theresa herself brought a vRS & then put higher octane fuel in it, she'd use the throttle more to see whether she could feel the increase in power, that is just human nature.

 

Problem occurs, that your bum dyno won't detect what could be a 2-3% increase in power but, after a tankfull you might comment it ran smoother personally, I think you'd have more chance of noticing an increase if you stepped upto Tesco's Momentum. 

 

What I know for certain is, that the team dynamics software will detect the difference in power on the JKM rolling road later next month & yes Momentum produces 1% more power than V Power nitro. It's also possible cheaper to Redex your car once in a while than use V Power as it's something like 5-7ppl more expensive 

Recent convert to Tesco Momentum from Shell Nitro and my 1,627kg Superb managed 546 miles on the first tank despite being a turbo petrol 4WD auto. And it's 12 pence per litre cheaper locally compared to V-Power.

Edited 26 January, 20206 yr by shyVRS245
MISSING WORD

1 minute ago, shyVRS245 said:

Recent convert to Tesco Momentum from Shell Nitro and my 1,627kg Superb managed 546 miles on the first tank despite being a turbo petrol 4WD auto. And it's 12 pence per litre cheaper locally compared to V-Power.

1,627kg WOW she was built for comfort, have you got DCC on that one ?

1 minute ago, themanwithnoaim said:

1,627kg WOW she was built for comfort, have you got DCC on that one ?

No it's a basic one with a spare wheel and Black Magic Pearl, just the 2 options keeping it light bro'.

I've said it before and I'll say it again

 

The multi-trillion dollar fuel industry is perfectly capable of conducting high quality research into exactly what their different fuel formulations do for both economy and performance for a wide range of vehicles.

 

That they have not, is strongly suggestive that it is all smoke and mirrors and marketing guff.

 

I accept that higher RON fuel allows for more power in cars who's ECU can exploit it, but that's about it. 

Although I have a 1.2tsi which is puny with no muscle I have found no difference either. Went across 6 EU countries up hill and down dale with 95 RON, 97 RON and E10 (ethanol mix) which compromises on power in favour of its greener credentials.

On 26/01/2020 at 09:12, shyVRS245 said:

Recent convert to Tesco Momentum from Shell Nitro and my 1,627kg Superb managed 546 miles on the first tank despite being a turbo petrol 4WD auto. And it's 12 pence per litre cheaper locally compared to V-Power.

How does that compare to your old Octy? I know the superb has a 66 litre fuel tank where as the Octy has a 50 litre. I always found my mk2 Octy stage 2+ ran better on Tesco momentum. Not sure about increase in mpgs but I averaged about 40mpg running approx 280bhp.

Edited 27 January, 20206 yr by Ecomatt
Autocorrect

@Jono

Just do not buy the snake oil then.  Do not be sucked in!

 

As to the testing of Octane that is not 'Rocket Fuel Science', just ICE and engine management.

Emissions can be what might be important with an efficient running engine.  

http://en.wikipedia.org/wiki/Octane_rating

 

http://volkswagen.co.uk/need-help/need-help-faqs/owners/Fuel

 

 

388380a097b04fe693a8c27db8bb4974 (1).pdf 6ca06d648b9541e78fa838fece4a1a23 (1) (3).pdf

4 minutes ago, Roottootemblowinootsoot said:

@Jono

Just do not buy the snake oil then.  Do not be sucked in!

388380a097b04fe693a8c27db8bb4974 (1).pdf 995.53 kB · 0 downloads 6ca06d648b9541e78fa838fece4a1a23 (1) (3).pdf 2.86 MB · 0 downloads

 

Nice info. Now all we need is someone who is an expert in that sort of testing to peer-review it for quality, biases and validity.

I mean, they don't even mention if the testers were blinded to which fuel was in or how it was selected, and their stats seem a bit sketchy, but it'd take an expert to unpick it properly.

 

I bet they were glad that their customer's fuel looked good compared to their comparator fuel, not good for repeat business otherwise.

 

What I take away from a brief scan is that 99RON offers some increase fuel efficiency over 95RON but there is little or no difference between the Tesco and non-Tesco sources.

39 minutes ago, Ecomatt said:

How does that compare to your old Octy? I know the superb has a 66 litre fuel tank where as the Octy has a 50 litre. I always found my mk2 Octy stage 2+ ran better on Tesco momentum. Not sure about increase in mpgs but I averaged about 40mpg running approx 280bhp.

Stage 2 Octy 245 averaged 40mpg so 440 miles on 50 litres so got an extra 106 miles for the extra 15 litres used. 38mpg in the heavier slower Superb (well slower for 1 more week anyway).

Tesco had the testers compared their 99 to their 95.

The only competitor with 99 was Royal Dutch Shell who is a business partner with Greenergy for the importation of the base fuels and the storage facilities.

 

The thing is they did publish the results. 

 I thought the comparison was about 'potential fuel consumption benefits and performance benefits' so that would also mean potential lower emissions from more efficient running engines that can benefit from higher octane fuel.

As to the Octanes of fuel, those are all tested and have to meet what they should be.  If you want to use the Min recommended fuel for a vehicle then that is just what you do.

 

 

Edited 27 January, 20206 yr by Roottootemblowinootsoot