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auldreekie

Petrol, Premium or Regular for Fiesta 1.0L ecoboost ?

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I normally use ordinary regular unleaded petrol  when fuelling up, would using Premium affect the 2014 fiesta 1.0l ecoboost engine causing a problem ?

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Premium/Super won't cause a problem.

Run it long enough it should adjust it's knock sensor and use slightly less fuel. (Thought not enough to compensate the additional cost).

On the 1.0 it's not really needed though and will run perfectly fine on regular fuel.

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If you want to use premium fuels that is your choice.

You may collect more points with nectar or shell if you use there garages

Jamie

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I got better mpg with shell than supermarket. Couldn't tell the difference between regular and vpower though so just use shells regular stuff now. 

You'd need an improvement of 7/8% in mpg to justify using vpower, I was getting no noticeable difference

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I normally use the standard Tesco or Morrisons unleaded in my 140PS Red Edition. I tried the premium unleaded from Tesco which I seem to remember being called Momentum. It made no noticeable difference on MPG. I also tried standard Shell unleaded and it did maybe add 10 miles on the whole tank (around 420 miles instead of 410 on a tank full before the low fuel warning comes on)  but I didn't consider it worthwhile paying the extra so have gone back to the cheap supermarket unleaded. Not tried Shell V Power as far as I can recall. I always use my car for the same journeys (mostly dual carriageway at 70 MPH) so I can get a reasonably accurate comparison. I believe the owners manual only specifies the minimum octane and so premium fuels are ok to use too and would not cause a problem.

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In the UK the lowest grade of fuel you can get is 95 Ron which is premium unleaded. The ecoboost will run quite happily on 91Ron unless towing or other severe duty usage. There is unlikely to be any benefit to running it on super unleaded so personally don't bother. 

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In Thailand there is only 91 and 95RON. There's a huge performance and economy difference with 95 way superior and only marginally more expensive. I can't comment on the difference with 97/98 RON. 

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I don't know if they still do it but the Shell garage next to the Maranello dealership in Egham was selling 102 RON petrol! Nothing but the best for the discerning owner of a Ferrari or two...

I don't notice much difference with premium fuel and it may just be a placebo effect. That said, supermarket premium fuel isn't 12p a litre more like Shell V-Power Vs the normal stuff round here. More like 4 or 5p, so I just bung or in. My dad however is convinced his two 3.0 cars do. The ST220 in particular. The BMW seems to be happy with whatever it's fed.

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The only car on which I ever noticed a difference fuel wise was an Astra SRi which I had for 7 years back in the 80s/90s at the time of the leaded/unleaded switchover - it hated unleaded but loved a good dose of 4 star!

Anyway, enough of the history. I have more recently carried out tests on 2 cars - a 182ps Ecoboost C Max and a 180ps Leon Mk 3 - both over about 6 months/6,000 miles and noted absolutely no difference in performance, economy or "feel" between normal 95 and 97/98. 

What I can't say is whether or not the various "super" fuels will keep your engine cleaner and running better over the longer term - I no longer do enough annual mileage to find out.

 

 

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