What the best gasoline mix to use?

[Ibr8k4vetts]

I have 10.5 to 1 with aluminum heads and can run 89 Octane.

[John McMahon]

If you guys want to sit here and guess and err on the bad side...go ahead. Any moder past (about 10.3:1) should be running on no less that 100 octane. I have seen moders detonate and punch holes in 4 out of 8 pistons due to this detonation. My AS Mustang was right on that line and I spent the bucks and bought the fuel as 'insurance', cheaper than a new moder.

Good judgement is usually in hind sight, spend the extra dough on an 11:1 moder and run the good stuff.

[Ronbo]

I dunno about all this...

We had plenty of cars from the 60's that had baseline engines running 10:1 and they seemed to run fine on 89 octane regular. The 12:1 engines were another story.

Scrap the carb and recoup the FI system cost in running pump gas, better milage, reduced engine wear, ect. ect. While your top-end may drop off slightly (although the guy at Kieth Craft said no), your actual operating range will improve greatly.

Unless your trailering your Cobra to the track it makes more sense to adopt the car to the fuel than the other way around.

As far as the gas, well we have a huge fuel storage area here in Jax I watched tanker trucks from four different companies fill up at the same BP pump station. (Texaco, Hess, Gate, and Shell)

Anyone see the T2 plant explosion? I was home that day, thought something hit the house (hard) and I'm about 5 miles away. Hellava bang, pretty much leveled everything within a 1/4 mi. of the plant. I've been told they found gurders from the building almost a mile away.

You can always add toluline or xylene but it's some nasty stuff, I don't like fooling around with it myself. Ketones like these make my stomach turn even from a wiff of them. I think this is what they made at the T2 plant. (news just reported it as "fuel addatives")