Jad wrote:OK, so what is the "something else" that 10% of the TT's are using?

I imagine it's the people using leaded race gas (110) mixed with unleaded premium. There's no choice for that in the poll, and several people (4?) reported using it in their posts. I used to do that for my high-compression 3.4 liter motor with single plug ignition--it's the cheapest way to go, as long as you aren't worried about killing O2 sensors or catalytic converters. One gallon of 110 mixed with 3 gallons of 91 gives you 4 gallons of about 96 octane (enough to prevent detonation on a hot day) for about $4/gallon.
TT