Coolant temp sensor and thermostat are both ok, any ideas on what could be the cause?
used to easily achieve 50mpg on the readout
now struggling to get 40mpg all of a sudden
thanks
poor economy what could it be? ***UPDATE***
Moderators: water01, vwnutant, desertstorm
poor economy what could it be? ***UPDATE***
Last edited by seb.g on Tue Dec 08, 2015 10:11 am, edited 1 time in total.