Stilo mpg

[Clintwilbourn1994]

Hi all my car had p0420 4 weeks ago, so I replaced lamda
Above cat as that's what it was and my
Mpg is rubbish around town, 33mpg even on a 40 mile round trip goes to 35 :/ should I use cataclean 1.4 16v stilo 05

 

[Zero0]

Check your engine oil or change the oil i had same problem, the oil stick is so shi*t so dont really trust it.