Hi Ed,
Your ordinary PIC ADC has a resolution of 10 bits. Yet, when it returns a result of 5 and you convert that to binary and you get 101, that's only three bits.....what's up with that?

Max reading from your sensor is 0xE66, Min reading from your sensor is 0x19A. 0xE66-0x19A=0xCCC which in binary is 1100 1100 1100 - 12bits. Strictly speaking I'd say the resolution is somewhere between 11 and 12bits.

/Henrik.