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Hey. I have travelled 2000 miles in the 5 weeks since I took delivery of my Cayman. The mpg is not great. I hope that it may still improve. I was told by the dealer to use "Super" unleaded (here in the UK that means 97 octane, I think?!) which is quite a bit more expensive that conventional premium unleaded (which I think is 95 octane). I was wondering, what do you guys use? Should I strictly use Super, or alternate with Premium?
I use UK 97 or 98 RON but I was told the regular 95 was fine. The way I look at it is that it adds about £3 to the cost of a tank, I save this money instantly by not buting coffee etc in the service station as I don't eat / drink in the car.
Shell Optimax (think it's called VPower now) for me, think it's 99 RON. Used it with my old S2000 and liked it, it seems to perform well in independent tests as well. Evo did one a while ago and it made a big impact on an Impreza on a dyno. I wouldn't use less than 97 to be honest, the dealer recommended the same.
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Hey. I have travelled 2000 miles in the 5 weeks since I took delivery of my Cayman. The mpg is not great. I hope that it may still improve. I was told by the dealer to use "Super" unleaded (here in the UK that means 97 octane, I think?!) which is quite a bit more expensive that conventional premium unleaded (which I think is 95 octane). I was wondering, what do you guys use? Should I strictly use Super, or alternate with Premium?
When you open the fuel filler flap, you will see a sticker that tells you to use Super Unleaded 98-RON fuel. Hence, you should use that. I use Shell V-Power which is 99-RON.
Using the correct fuel as recommended by Porsche will give you better performane and better mpg.
I've used Shell V power here in the USA since delivery. At 2K miles I was getting +/- 22 MPG. I'm over 5K now & get 23/24 with mostly rural driving.What is your MPG at 2K?
guys i use shell v power racing which is 100 octane, am i wasting my money..
my dealer said its best to use it, but also that its best to just stick to one type, but he may work for shell in his spare time!
guys i use shell v power racing which is 100 octane, am i wasting my money..
my dealer said its best to use it, but also that its best to just stick to one type, but he may work for shell in his spare time!
I don't think the ECU can take advantage of anything more than 93 or so. It needs to be able to deal with a range of fuels without doing damage to the car. In California, we have 87 octane through 91 octane. The ECU has to be able to handle 87 octane without blowing up even though the car "requires" 91+.
The conventional wisdom at the track is that 50/50 100 octane/ 91 octane is about the most our stock ECUs can take advantage of. My brother's car has an OBDII programmer that flashes his ECU for 100 octane. If he then uses 91 before he flashes it back he can screw up his car.
Interesting, I'm under the impression (that could well be wrong!) that the European cars at least are set up to assume 98 RON (hence the sticker on the filler advising not to use less). Using less than the recommended level means that the ECU will retard the ignition to avoid 'pinking' which can damage the engine. So there is no danger to the engine by using lower octane fuel but you will suffer a degradation in performance.
It's a different question as to benefit of higher octane as a more sophisticated setup is required to take advantage this (advanced timing, etc). I would have assumed that that our cars have this but that's a guess. For sure any benefit would be more pronounced in FI engines than NA.
Interesting, I'm under the impression (that could well be wrong!) that the European cars at least are set up to assume 98 RON (hence the sticker on the filler advising not to use less). Using less than the recommended level means that the ECU will retard the ignition to avoid 'pinking' which can damage the engine. So there is no danger to the engine by using lower octane fuel but you will suffer a degradation in performance.
It's a different question as to benefit of higher octane as a more sophisticated setup is required to take advantage this (advanced timing, etc). I would have assumed that that our cars have this but that's a guess. For sure any benefit would be more pronounced in FI engines than NA.
Your octane rating is based upon RON, whereas in the US we use (RON+MON)/2...so 98 RON= 93 octane in the US.
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