Sudden drop in MPG?

[Sim_Simma]

I average 20 in the M but when I took it to France (drive from Sheffield to Dover then driving around Calais) I averaged 32!

..but ya cant trust them foreign miles, cans ya, theys much smaller than proper english miles... evr'one know that... :wink:

 

[speed12]

As others have suggested, just to prove otherwise If I were you I would remove the spacers as an experiment and see how that goes. If it were an engine/ sensor issue It is one hell of a coincidence for it to happen at the same time as the modifications you have fitted?

 

[NeilP]

When was the last time it was serviced?

 

[Xiaxio]

What have you been eating differently since the drop?