I have a 2008 Nissan Micra that I have owned from new, and in the time I have owned it I have had to replace the rear tyres twice due to them wearing on the outer edge. I went to an independent alignment centre and they produced a report stating that the rear wheel alignment was outside the acceptable tolerances. I went back to the garage I purchased the car from and they took the report, and later contacted me to say that the tolerances for my model had actually changed and it was now just inside tolerances. The fact is that I am replacing the rear tyres at a rate of at least twice the fronts. Any advice would be greatly appreciated.