I always use 93 octane in the 951 and the 964 (and the bike) everything else at home gets 87 octane...

 

My bad- after looking at a gas pump today when I filled up the pickup. I run 93 octane- premium.
I DO get better mileage from more octane but never did a break even analysis on cost per mile VS fuel cost to verify the results. I always thought higher compression ratio meant higher octane required..

 

Humboldt Co. is notoriously expensive. I think the 91 (which is the only fuel I put in the P-car) is close to $2.20 now.

Also, I can get over 30 mpg on long highway trips. I got 27 mpg driving up from LA when I first got the car--that's averaging 80 mph.

B

 

I paid something like $2.37 per gallon for 91 octane gas at a west San Francisco gas station yesterday. Normally I wouldn't have gone to that gas station, but I was on fumes and literally coasted to the pump!

 

steve you got ripped! that is the most expensive i have heard in the City! where was that!?

 

</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Can anyone give a simplistic explanation bewteen RON/2 and just RON?</font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">just curious and didn't use the 'search' link....

 

I run the 87oct. have no detonation under any load, the car is a daily driver and I don't really flog it.

The PO. told me that he always ran 87 and that some stations sell 87 that the car doesn't like and some sell 87 that the car does like. I have ran 93 in it (we can't get 91 here) and didn't notice any difference.

I've always been told that if your car doesn't spark knock you can get away with a lower octane.

Now if I were to do a track day or something I might, but as a daily driver I don't see the need.

That and I'm cheap by nature, if I were to notice a real benefit I would.

 

Last I checked it was $0.895CDN/litre for 87 here... equates to $0.582USD/litre or $2.20USD/gal. 93 should be going for $0.995+CDN/litre.

 

Chris you must have been driving downhill the whole way with a tail wind. Just kidding. At the moment my milage sucks, 250 miles of mostly stop and go driving, with occasional runs to redline, from an 18 gallon fill up. I bought 17.8 gallons of 93 octane this morning for $38. This stuff is getting expensive.

Mark T.

 

Paul, your car has a knock sensor and the computer has the ability to retard timing and alter mixture to prevent detonation. You might be costing yourself some power with the lower octane fuel. Having said that, running more octane than you need is not only a waste, it is actually counter productive, as high octane fuels burn slower than low octane ones. The octane rating of the fuel is simply an indication of resistance to detonation.

 

Mark: I don't quite understand.

"You might be costing yourself some power with the lower octane fuel."

this means higher octane = more power?

"Having said that, running more octane than you need is not only a waste, it is actually counter productive, as high octane fuels burn slower than low octane ones."

this means it's more productive to run lower octane fuel? Could you elaborate?

tia

 

</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 deni durrell:
<strong>steve you got ripped! that is the most expensive i have heard in the City! where was that!?</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Union 76, California and Arguello, just south of the Presidio golf course. I didn't fill the tank, and actually considered myself lucky. If the gas station was a block further, I would have been grabbing a gas can. I can't tell you how many stop signs I blew just trying to conserve momentum, and therefore gasoline.

RICK: We did! We pulled it off! I can’t believe it! Where’s the needle?

KRAMER: Oh, it broke off, baby! Woo, hoo, hoo!

RICK: Oh, Mr. Kramer, I gotta thank you. I - I learned a lot. Things are gonna be different for me now.

 

steve, with the money you spent on that, you could bought us both gas and still saved some cash..

 

</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 deni durrell:
<strong>For those of you that aren't in USA, that equates to €0,52/l (?).....</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">I am paying about $.45 per liter for 93 Octane here in Germany, on base that is.

 

</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 deni durrell:
<strong>Mark: I don't quite understand.

"You might be costing yourself some power with the lower octane fuel."

1) this means higher octane = more power?

"Having said that, running more octane than you need is not only a waste, it is actually counter productive, as high octane fuels burn slower than low octane ones."

2) this means it's more productive to run lower octane fuel? Could you elaborate?
</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">1) if you're running fuel that requires the engine management to retard timing, you're costing yourself power by not allowing the enging to run at it's full capability.

2) if you run to HIGH of an octane fuel, then the engine has to expend more energy to detonate the fuel (or doesn't get the same force from the ensuing explosion) - thus keepign you from making the most power.

Most people would rather run to much than to little - just like performance tuners always err on to Rich instead of to Lean. It's just the lesser of 2 evils when looking for the narrow ledge where everything's perfect.