I learn something new every day! Thanks RTexasF!

 

here is the link that said it.....http://everything2.com/index.pl?node_id=1371221
i think i am gonna keep using the premium cuz i do feel difference and after putting cold air intake in the car
it's a really big difference

 

oh and i do think it's worth it :-)

 

 

dayum, now that's what you call an engine bay! haha and i'm not talking about the SF bay, that's more like gulf of mexico! haha

 

oh wow nice i dont got the money to do all that but soon i will :-)

 

Lol it has a J32A1 looks nice.i want that grille he has

 

Lower octane burns quicker ----> more power. Higher octane fuel is meant to prevent knock (pre-ignition) on higher compression engines. 10:1 CR should use mainly plus fuel IMO (91 octane). The older J30A1 was proven to get better performance from 87 octane than 93, but it has a CR of 9.4:1.

 

Don't agree. The higher the octane the more efficiently the engine will utilizefuelGIVEN a matching compression ratio. 9.7/1 won't get anything or very little out of 93 octane. 10.5/1 will efficently utilize the octane but still isn't worth the premium price. The question is whether the incremental cost is worth the performance and mpg. Takes 1.4 gal of E85 to equal the mpg of 1 gallon of gasoline. However if the compression ratio is boosted to, say, 12/1 then the differential shrinks.The V6 is 10/1 and will efficiently use higher octane fuel. My rule of thumb is that I will use 91 octane provided it is within 5 percent of 87 octane. Better performance, better mpg. Close enough to justify.Wife's 05 Sable is a Duratec 30 with 10.5/1 compression ratio. Ford says 87 octane BUT the engine, aluminum designed by Porsche, will efficiently utilize 91 octane with better performance. She doesn't care so 87 is the fuel. It takes a tank for the PCM tto adjust the timing map to higher octane fuel.

 

Then don't agree. For other readers, please do your own research before buying into any of the schemes. Most vehicles will not adjust to a type of gasoline. As far as I know, only flex-fuel vehicles do this to make it possible for them to run so much alcohol.