Has anyone ever gotten a 12-SCT engine to last 7 1/2 minutes on one tank?

I'm racing on a small/medium track that's pretty technical (therefore not too much time is spent on the throttle). My engine is way more than enough power for the track, losing power to accomplish the goal would be OK. I'm wondering if there's any chance I could get 7 1/2 minutes between the pits (race is normally 15 minutes).

My ideas:

- 16% fuel
- Novarossi exhaust cooling device
- Whatever pipe is most economical (would need to buy one)
- Smaller venturi

Think I have any chance at all?