Burnable Ballast???

[Ron Dillman <rdillman@cat2.com>]

With cars like a Mustang (all weighton wheels in the front) in autocross
what is the general opinion of fuel tank capacity for autocross use?
1) Keep the tank at least 1/2 full or better. Keep s the fuel inlet
covered under all cornering conditions and puts weight in the back
wheels where you have no weight.
or;
2) Keep it light, the extra weight is not worth it no matter where it
is.

Would like the group opinion on this.

Thanks