/Quote from Andy
Unfortunately, I think floating-point support is excluded from the free Keil Evaluation. :-(
/End quote

But it is included in the free Raisonance evaluation (shamless self-promotion), hence my suggestion.

To the OP:
As for keeping the code size at a minimum, consider that the libraries are written in assembler and that, if you want to do the same thing (managing and printing fp numbers), you will probably end up with a code as big (if not bigger).
Printf will send its output thorugh the putchar function: you rewrite that to use your LCD rather than the serial line and you are done.
I'd guess your whole application could be <2k.

Regards,

Luca