It took me 3 years of research to find the fix for my 2006 mazda 5, gasolline engine, driven mostly in Virginia - USA
I am not a mechanic and I had to deal with total denial coming from MAZDA USA, from mazda dealers, from tire sales people.
The 2006 model has a major engineering problem in regards to aligment on all 4 wheels; the back wheels are worse then the front!
If you take the car to be fixed, every shop and even the mazda dealer will tell you that the alignment is OK; but it is not ok!
They do it up to factory specs in the computer but the factory specs are not correct!
The toe in and the camber of each wheel is deeply negative especially in the back
look at the wheels put a construction level on each of them!
you will see how much they ar off level vertically
if you take the vertical deflection in degrees and compare it to the inside wear you will see - they are equal in size
your wheels do not sit vertically on the road so then instead of smooth rotation and normal wear, you get a dragging acction, intense wear and dangerous cupping that can lead to tire explosion and in the long run to the destruction of the entire suspension system.
you need to find a shop that will do a custom alignment with camber and toe-in anjustments based on fact not computer specs.
you will find people with experience in small shops that know what they are doing.
the shops that work on race cars, hot rods vintage cars are experts
they can even order custom arms to bring those wheels down to - 0.36 off vertically.
that is the normal number on every car (on my mazda it was -2.63)and the dealer said that it is an OK number given by the manufacturer as "whithin limit" ((((
DO NOT TRY to fix your car at tire dealers like Goodyear... they will sell you the most expensive tires they have and not fix the problem !!!
they are in the business of selling tires for a profit not giving you a hand out !!!
The best tires to go on this car are made by Michelin - it is a stronger tire that will give you more miles of use.
I hope it was helpfull and if you have questions I can give you more details
mazda is part of ford and i know ford has the same problem on some models
as a favor to all mazda owners please try to call mazda and file complains as many times as you can and spread this posting to others!
it will lead to some form of reimbursement for your time and efforts from mazda!
mazda tribute and mazda 3 has the same problem !
good luck!