the "...recommends" list goes on and on and on...some may be crucial while others may be fine. I recommend you guys to make your own decisions.

 

Interesting comments and article.

However, we drive our vehicles until they die.

Back in 1988 when I was selling Toyotas I got into the octance requirement with a Camry customer. He was the controller for a large company that had a fleet of over five hundred trucks of various sizes all gasoline powered. They decided to experiement when they upgraded part of their fleet and ran regular in half of the new vehicles and premium in the other half and kept track of the repair cost for the life of the vehicles, including the extra cost of the premium fuel. The result was that the vehicles that ran premium lasted longer. Less valve jobs required, and that in the end including down time, running premium fuel paid off.

I also had another Camry customer, an women in her sixties and she documented that the improved gas milege that running premium yielded make up for the difference in cost at the pum (at that point in time).

On my last trip running at 80 MPH I got 27.1 MPG. I have gotten as high as 33.6 with my foot out of it. (no V-Tec)

P.S. Our 4.0 L V-6 Ford Exploder pings like crazy in the summer months on 87.

 

93 only, here.

 

Here is an interesting gas test video.

The results on the Impreza with Shell Optimax is too good to be true

 

The old 87 vs. 91+ conundrum. A volume tall enough to reach the moon could be written on this subject. How do petro companies determine the octane rating, knock engines, flash point, gas chromatography? Is it possible that a 91 at one company might be an 88 at another. Do they, or anyone, test the gas after it's been delivered to the gas station/quickie mart? 87 might find its way into a 91+ storage tank. On a 13 gallon fill up the difference between 87 and 91+ is what? $3.00. Who cares? Go with the so-called 91+. If you think you hear knock when using 87 plug in to the OBD II port. If you want to save money on gas use the shift points in the owner's manual.

 

Taken from the article:

"Automakers say they don't test premium engines on regular to check the difference, but some auto engineers estimate that power declines roughly 5%."

That's roughly 12 crank hp on the S. Some people spend hundreds of dollars on an intake and exhaust to gain that much power, yet some don't mind losing it by saving a few cents per litre at the pump. It all seems quite bizarre to me. I think I'll continue to fill up with 94, especially since a local station offers it for the same price as regular every Thursday.

 

I always use at least 98 octane on my S , here in sweden we have the options of 95 or 98, might be some 96 someplace to, and of course Shells "performance" fuel , V-Power, should be 99 or something? So i'm using 98 octane and v-power, depending wich fuelstations i locate

 

sweden rules.

what's the cost of living like there?

 

On the inside of the gas-cap cover it says : use RON 98.
Thats what I do, the BP Ultimate 98 and it runs fine.
I have tried Euro 95 (had to) and it doesnt want to rev so easaly.
I have tried Shell V-Power in Holland (its RON 97) and I didnt like it.
The V-Power in Germany is RON 100 and there it goes
But I dont live in Germany.
Shell makes different V-Powers for different country's.

 

I miss the good old days when you could get Chevron white pump (about 110 octane).