Super-unleaded or unleaded?
Discussion
[quote=richrackSo I guess what I was asking - can anyone really feel the difference in performance in day-to-day driving, or notice any difference in fuel consumption?
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While not in the same league, I noticed a drop in MPG when I used 95ron in my R32. Was nearly 3-4 mpg less (according to the computer). The acceleration didn't feel as urgent either.
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While not in the same league, I noticed a drop in MPG when I used 95ron in my R32. Was nearly 3-4 mpg less (according to the computer). The acceleration didn't feel as urgent either.
I was very sceptical until I did a week's holiday in Devon. Having run on shell-ordinaire for many months I was used to the performance on my Cayman (2.9l Gen2). Needing to refill, I popped into Tesco and tried their Momentum super-unleaded and thought nothing of it as we continued to potter around the moorland roads. Then, after about 20 miles, I got an opportunity to extend the car and the mid-range part throttle response was markedly improved to the point that my wife (passenger) commented on it. So now it gets Shell VN or equivalent whenever it is available.
As mentioned before by someone else, to have an expensive sports car and hamstring the performance with cheap fuel seems a little crazy.
As mentioned before by someone else, to have an expensive sports car and hamstring the performance with cheap fuel seems a little crazy.
gsewell said:
I was very sceptical until I did a week's holiday in Devon. Having run on shell-ordinaire for many months I was used to the performance on my Cayman (2.9l Gen2). Needing to refill, I popped into Tesco and tried their Momentum super-unleaded and thought nothing of it as we continued to potter around the moorland roads. Then, after about 20 miles, I got an opportunity to extend the car and the mid-range part throttle response was markedly improved to the point that my wife (passenger) commented on it. So now it gets Shell VN or equivalent whenever it is available.
As mentioned before by someone else, to have an expensive sports car and hamstring the performance with cheap fuel seems a little crazy.
^^^^^This. Well worth the extra £2ish per fill, makes a noticeable difference.As mentioned before by someone else, to have an expensive sports car and hamstring the performance with cheap fuel seems a little crazy.
A week ago my tank was empty and I found I'd stopped at a filling station with only unleaded and diesel, so I bought a full tank of regular unleaded. Since then I reckon the car has been "pinking" from time to time, especially under low rpm acceleration. Anyone else noticed this?
Today my tank was half empty so I've topped up with Esso 97 and will be interested to see if the pinking subsides once the mixed fuel works through the system.
Today my tank was half empty so I've topped up with Esso 97 and will be interested to see if the pinking subsides once the mixed fuel works through the system.
richrack said:
The Drivers Manual says "The engine is designed to provide optimum performance and fuel consumption if unleaded fuel with 98 RON is used. If unleaded premium fuels with octane numbers of at least 95 RON are used, the engine's knock control automatically adapts the ignition timing."
Hmmm. Sounds like my particular tank of boggo unleaded was just a bit too marginal for that 95. Aha! Just looked back through my credit card receipts and then used google maps to look at the petrol station - unusually I had stopped at a TOTAL site. Usually I go to Shell or Esso. Perhaps there's a message there ...
richrack said:
I drive a 987.2 Boxster S, and when I picked up the car, the Porsche dealer told me I just need regular unleaded petrol. I asked about Super-unleaded, and he said that only turbo-engined Porsches need super. For my kind of mostly "sensible" driving, unleaded seems fine - I mostly use Shell. I have occasionally tried super (Shell V-Power), but for day-to-day driving could not feel any difference, or notice any difference in fuel consumption. Maybe I'm not driving fast enough to tell!
I intend to keep the car for a long time, so want to make sure its the right choice. Any views on choosing between unleaded and super?
As well as the current thread, have a read of this one on the same topic.I intend to keep the car for a long time, so want to make sure its the right choice. Any views on choosing between unleaded and super?
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
Ian
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