low mpg

[coxxy]

just been flicking through th forums and sum1 said that there mpg has gone DOWN to about 28/29. ive not had my 172 for long but its never gone above 25mpg. what could be done to emprove this.

 

[Fluxuk05]

New lambda sensor.

And drive more efficiently.

 

[Matt W]

Might need a service too.

Mine sits at 39mpg average over around 2000 miles

 

[coxxy]

ive just serviced it. when i had it i did put a new cat on it. had to heat up lambda sensors to get them out old cat. wheres best place to get them from. would i need to change both of them?

 

[coxxy]

which lambda sensor should i change first, the front which is regulator or the rear which is diagnostic. not got cash to get both at the same time

 

[newqs36]

also interested in answers on this one