[99LeCouch]

With a high-strung engine like that, real-time feedback is crucial. You'll be able to see what works in real time, not just at the end of the tank.

Also, use the turbo as an asset. There may be a point where it just starts to spool that offers a few MPG better since it's pushing more air but not more fuel. Sometimes it's more efficient to accelerate briskly to your desired speed rather than slowly, since that uses slightly more fuel for a shorter time for greater acceleration.

Try out a bunch of things, and let us know what is working!