Sorry if some of you have seen this before on another site. I am aware of the 3 selection types as in the topic title. However, what is the general feeling on which is best to use. MY XT never goes off road and I live in a very flat part of suburban UK. I have heard that when using 2WD it can cause excessive front tyre wear, when in Auto can cause mechanical issues, and in 4WD will provide poor fuel economy. I am good at keeping tyre pressures at the recommended level and do check/top up as required. Anyone out there have thoughts/exeperience on this?