Something different Building for MPG.
Back to basics:
I don't know at what ratio you are injecting the alc. But keep in mind you are paying $6.32 per gallon if your $.79 is for a pint which is usally how it comes.
As far as the thread goes- Friction is your biggest enemy, whether mechanical, aerodynamic, or fluid. The complete consumption of the fuel to its component parts oxygen, hydrogen, nitrogen is the next hurdle.
With the advent of after market anti friction coatings, and roller accessories alot can be done about internal mechanical friction. As far as rolling friction goes there is some interesting work being done with magnetic fluids. These are lubrecating fluids with partial magnetic properties that will keep a wet surface around a shaft with a permenent magnet inbeded in the shaft. The research is primeraly being focused on wind turbine bearings right now. This might some day also be applied to our stuff.
In the mean time we also have aerodynamics to consider. I know as far as my build is concerned (73 Duster) I just enter the standard coefficient for a kenmore side by side into the equasion.You superbird guys have it made.
When I had my Duster on the street it hed a 3.23 rear and got 18-20 miles/gal on the highway.
With the new buld I'm shooting for 25 MPG.
The final thing that can be done is to weld shut the secondaries on your carbs.
I know good luck.
Andrew