im inclined to agree with "rfernatt" on the wear pattern. if you look at the smartie from the rear you can actually see that the tire is not square with the road but favoring the inside tread for more contact which would naturally wear the inside of the tread more readily . . and on my 20k mile tires, one can actually see that clearly occurring. moreover, personal knowledge base use over the last 40 years has shown me that the front tires wear just as "rfernatt" has said, the outside edges wear thinner due to cornering regardless whether it is casual slow turning or higher speed "hurry" style turning and/or pulling in and out of parking spots.
thus this methodolgy of front to back and back to front each remaining on same sides is an excellent analogy and consistent with all manufacturer's recommendations. therefore, i will certainly do the same and go looking for new rims and new regular tires for the front while my rears have about 20k on them, and when the rears are ready for replacement in 10k or so, i'll take the fronts, move them to the rear with about 10k on them, and put new tires on the rear rims that will now move to the front and then leave it that way for about 5k and start a regular habit of rotating at oil changes like normal. plus i'll have a spare now and sell off a front rim.
anyone know if the front rim and tire can be put on the back as a spare to go say 50, 100 or so miles?