Pass Gas?

[hopman]

My 2003 Cobra owners book indicates that I should use 91 or higher octane. What happens if I use 87 octane instead? And since I have not found anywhere that sells 91 octane (its all higher or lower), can I mix 93 octane and 87 octane about half and half to get about 91 octane?

[monsterpost]

Well if you like detonation go ahead and use 87 octane. Seriously don't run 87; just say no to 87, your engine will love you for it. If I was you I would run 93 octane all the time. It may cost a little more but it beats haveing to replace your engine when you find a rod sticking out of your block.

[animal]

Don't do it! run the highest octane you can get (92 or 93) as it helps prevent detonation. Some tuners can tune for 87 octane if you really wanted to but you'd lose a ton of performance out of the car simply because you'd have to detune just to run the crappier gas.

Really though you bought a high performance car, don't worry about the extra 2-3 bux per tank, you'd be better off watching what you do with your foot than you would be trying to baby the thing with 87 octane. That said, in a pinch it will run with it, just STAY OUT OF THE BOOST if you do run it.

Don't bother mixing down to get 91. Just go get 93 whenever u can.

That rating of 91 or above is only because california has 91 octane as thier "premium".