v6 ecotec guzzling fuel

[mahooody]

i changed my thermostate and i thought it made a difference but after about 100km out of each tank it goes back to using heaps of petas again am goin to replace the coolant temp sensor next and if that doesnt work i will be replacing the oxy sensors, let me know if there is any other sensors that can affect the fual consumption cos am sick of paying **** loads each week.

Thanks