damn, 1.80 a gal for 91???? its 1.69 for 94 here... and 1.92 for turbo blue 100 octane at select exxon gas stations i feel sorry for you guys. and yea, i definately wouldnt recommend 87 octane in any car, let alone a porsche.

 

There was a program on Discovery not too long ago about how Gasoline is transferred to different locations throughout the country. was pretty interesting- there are 30 some diffefent "blends" for sale and where you live depends on the blend you get. The cost of refining the different blends is why the price is so different from area to area. They also admitted that the 91 octane at Speedway or Clark is the same fuel you would get at a Shell in the same vicinity. It ALL travels thru the SAME pipeline in bulk, the only difference is that some distributors blend in additives just before it goes into the delivery tanker (i.e. Techron )
I was amazed -

 

I've seen over 550 miles on a tank before - I was on fumes pulling into the gas station though. The best part was that the trip was spirited backroads driving mixed with a little interstate. I'm thinking that the stop and go has more to do with economy than how hard you stop on the pedal (within limits, track use is different).

We're at $1.67/gal here in Atlanta for the good stuff. And do the N/A cars really call for 92/93!!?!? I can't imagine that they would which means that you're spending extra money on nothing, if not actually getting less performance. I know my motorcycles dyno less HP with higher octane fuel (it's designed for 87, I loose 3~4hp with 92/93 and over 10 with 102) and imagine the same would be true for Any internal combustion engine.

 

You will get no benefit from using higher octane if your car dosn't call for it. Yes, that Discovery show was interesting.
Gas just rose here about .40 in the last 2 weeks...Can we all say gas Price gouging is alive & well!

 

i know the recommended octane is 91 for the 951 but i dunno about the N/A

 

They say to use the cheap stuff in my NA.

 

Really???

I know on my gas flap, it say's 91 minimum. I have an S - I wonder if they call for 91 in the S and Turbo only???

We only get 87, 89 and 91 around here. The difference between 89 and 91 isn't that much, so I always go for the 91.

Never tried anything lower than 91.........and add NOS Octane Boost once in a while (don't need it now-a-days due to the cold air giving me that extra ohhhhmph).

944S Boyeee

 

The NA cars typically run higher compression ratios, which is the reason for the high octane requirement. The higher the octane, the more the fuel/air mixture can be compressed before auto-ignition becomes a concern. It's really more beneficial with forced induction engines where one can adjust the boost. Could go on for hours on the subject, but that's the jist of it.

Right now gas is running $1.80 for 93 in O-town. Was about $1.60 two weeks ago.....yes, price-gouging really is alive and well. Grrrrrrr...

I could've sworn the places like Racetrack diluted their fuel with alcohol to sell it so cheap. Either way, I don't trust that stuff.

 

I'm surprised more americans don't come up here for their gas. It's cheaper, and we get the good stuff (at least here in BC) - 94 octane (Supreme Plus) at Chevron. The idea of putting 91 in my 951 makes me cringe.

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Originally posted by 944S Boyeee:
<strong>I wonder if they call for 91 in the S and Turbo only???</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">944na 83-87 (M44/02-07): 9.5:1 CR, 87 octane
944na 88 (M44/09): 10.2:1 CR, 91 octane
944S (M44/40): 10.9:1 CR, 91 octane

Turbos, obviously, have dynamic effective compression ratios, so octane required is a function of boost level!

 

Well, if it's any consolation I paid around $70 to fill the 951S last weekend here in Europe, so cheer up folks. Gasoline prices in the U.S. are still among the lowest in the World.

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Originally posted by Luis de Prat:
<strong>Well, if it's any consolation I paid around $70 to fill the 951S last weekend here in Europe, so cheer up folks. Gasoline prices in the U.S. are still among the lowest in the World.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva"><img border="0" title="" alt="[Eek!]" src="eek.gif" /> <img border="0" title="" alt="[Eek!]" src="eek.gif" /> <img border="0" title="" alt="[Eek!]" src="eek.gif" /> <img border="0" title="" alt="[Eek!]" src="eek.gif" /> <img border="0" title="" alt="[Eek!]" src="eek.gif" /> <img border="0" title="" alt="[Eek!]" src="eek.gif" />

Hows does anyone afford to go anywhere over there!!! If I was spending $70/tank on gasoline I don't think I would have ever moved out of my parents house! Since I've never traveled outside of North America, is the public transportation better or do moe people ride bicycles/live within walking distance of work? Maybe the world salary is just that much higher as to pay for fuel consumption.... whew, I'm obviously unedumacated in this respect.

 

Brian, your response is kind of ironic because as we speak I'm cramming for a test tomorrow... Guess what for? You guessed it: motorcycle license!

Yes, public transportation is quite ubiquitous and good here, and in warm climates like southern Europe, there are more motorcycle registrations than cars. You'd be a happy camper on your bike all day, whereas I still long for weekends when I can sit behind the wheel of my 951S...

 

What I do know is that we have 9.5:1 compression because Porsche was taking into account that inferior petrol exists in North Am. and people may be using it. I have heard many people say that using higher octane gasoline is a waste of money, but I do not concur.

I have found two things, a. my car revs a lot lower running from 70mph/112kph, to 90mph/144kph and to 100mph/160kph; and b. the increase of power can be felt driving on the freeway and in the city. I have not yet tested fuel efficiency.

On lower octane, the car "feels" like it has to exert more effort going from a to b- I have tested this using Shell 87 octane and found that yes, it does rev higher with the same driving habits.

Unfortunately, Re: 9.5, I don't think higher compression would work well for us here in California, due to strict emission laws etc. I think 87 octane is okay if performance weren't an issue. Can anyone give a simplistic explanation bewteen RON/2 and just RON?

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Originally posted by 944S Boyeee:
<strong>Never tried anything lower than 91.........and add NOS Octane Boost once in a while (don't need it now-a-days due to the cold air giving me that extra ohhhhmph).

944S Boyeee</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Mmmm placebo.

(talking about the NOS octane boost, not the cold air)