I wanted to amend Kevin's post - I did run a 13.4 at 106.9 MPH. There was wheelspin all the way thru 1st and 2nd gear - in second I was modulating the throttle to get it to hook...
then I was shifting manually, as the current trans tune would shift a bit early at WOT, and on the 2-3 shift I hit it a little late, so I lifted off the throttle totally to let it shift then got back on it.
It was only my 2nd time ever down the 1/4 mile, and the first time was just a few min earlier in the GTO... but that was just plain a bad run so I don't want to talk much about it, other than I was low on fuel.

At the last stop of the tour I put the car up on the Dynomax dyno. Two quick runs from 4000-6000rpm netted 346HP and 366TQ at the rear wheels.
The car scoots out nicely and I averaged 18-20MPG for the power tour. My best tank was 25.3MPG and the worst was 11. Most of the tanks were in the 17-18-19MPG range.
Keep in mind any time I floor the car there is fuel that sloshes out of the fuel filler neck- so I'm sure that cost me a little in the MPG department.