The Dodge Challenger Message Board

What kind of octaine should I use with my car,I have beefed it up of course with Holly carb,edlebrock manifold,stuff like that,but should I always fill up on the big 94 octaine gas or the cheep 89 octaine is just as good?

Use the 94.

In the States, we have three octanes to choose from at the pump, 87, 89, and 92. There is a BP station near the city of Sumas not far from where I live that sells 100 octane gas, but you can always buy some 108 or one of the other well known brands of octane boosters. I believe that you could buy the brand that would raise the level of octane in your tank to 112. Octane boosters a very inxpensive, between $6-$18, exchange right now is about $1.60 American for every 1 English pound, so it is not expensive for what it can do.