A correction to my not so good example
Code:
'Lets say 
TXI = 0
GOSUB D_INDEX
' Now TXIU will hold the value 2500
" If Index is zero, Var is set to the first Value."

Would it be faster and take up less code if I placed the table inside of an eeprom.
Faster-- No, it takes time to read the EEPROM. Less code-- Probably yes.

If I am reading a temp of 70.8 is it possible to store that in a 1 byte memory location.
Not that I can think of.