Set Tank average MPG as a gauge
TXD: 04
RXF: 800000000000
RXD: 0000
MTH: 000000000000

I have also added this but the guage read out goes to 10 or 10.1 it never changes I have doubled check the coding and I have put the code in correct???
 
the coolant temp is 40degress higher than the water temp even from cold, so whats the differences between coolant temp and water temp, also tried the transmission temp and no read out, is this something on the cupras the 1.6 dont have.