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Posted 24 October 2003 - 04:50 AM
Posted 24 October 2003 - 06:28 PM
Honestly, it's a good rule of thumb to go up one octane rating in real world conditions, especially if you do a lot of city driving in traffic.
Plus, many engines are tuned to run on 87 and made safe that way by the use of a knock sensor. I'm actually unaware of ANY new car that doesn't do knock sensing. There might be, I just don't know about it.
I have found, with several different vehicles, that running 92/93 octane gas lets the engine management systems run the timing up enough to make a small but noticible difference in the seat-of-pants feel and a measurable difference in gas mileage.
On my 2000 Forester I have actually seen a 3mpg difference going from 87 to 93.
Finally, you can actually make your own octane booster at home. Well actually, you don't make it, you just by Toluene at the hardware store and add it to your gasoline.
Since the gas companies already add toluene to gas to enhance octane you should stay below a 4:1 mix (20% added toluene.
If you're in a country that has that cheap 80 octane straigh gasoline, you can go 2:1 (33.333% added toluene.
Here are some links you may find to be interesting:
Rocket Fuel FAQ
An Audi Site
A Turbo Buick Site
Posted 26 October 2003 - 06:43 PM
Posted 27 October 2003 - 05:42 AM
That was very interesting stuff about toluene. It would be more reliable than MAYBE getting 93 out of the ground at the quick-stop.
Posted 28 October 2003 - 02:05 PM
For my hotrod though, the toluene method is for damn sure cheaper than buying 100 octane CamII at the station down the road.
Posted 28 October 2003 - 11:34 PM
Posted 29 October 2003 - 12:02 AM
Here is the simple rule I follow: the higher the octane, the more energy is required to burn the fuel. Cars that typically require premium fuel have higher compression ratios (or forced induction) and more advanced ignition systems. Cars designed for 87 do not have these features and may not run as well on high test gas...
Posted 29 October 2003 - 05:58 AM
Posted 29 October 2003 - 06:10 PM
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