Aftermarket TPMS tools can read unregistered sensor IDs, I don't think Techstream can...but I could be wrong. iPhone ?
I chose the Defenders over the Energy Saver AS, because I wanted the 90K tire and it is listed as an LRR tire. The first two tanks of gas was with a really horrible driver for MPG, and then the 1100 mile trip home. The mileage was really looking bad, one tank with the cruise set at 85 only netted 42.6. This tank that is more like we normally drive is looking like about 3 MPG hit over the Goodyear Fuel Max. Hopefully it will get better after some miles, but I'm thinking I'd been better off going with the Energy AS. I know that Michelin has the 30 day satisfaction guarantee, but it reads that I have to go back to the dealer that installed the tires to make the switch. Live and learn.
That doesn't sound to far off what I would have estimated. Comparing the Fuel Max and Defender at the same wear point I would estimate a 2mpg loss. The Energy Saver A/S is 1.5-2mpg better than the Fuel Max.
So back to Energy Saver A/S vs Defender discussion, how well do the Energy Savers A/S handle for normal driving ? Are they as good as the AVID S33 that come with the Prius ? I've got snow tires for the winter and the S33 work for me for the summer, but I don't want to go with the Energy Savers if they are worse than the S33's. If they are, I'll go with the Defender.
Originally, my car had the Yokohamas, and they were worn out at 34,300 miles. I got the Michelin Defenders for the good wear life, high rating, and good handling. I got 47.3, 47.5, and 50.2 mpg in three summers on the Yoko (the mpg went up as they wore down), and 45.8 mpg so far on the Defender (summer is always better than winter mpg). When winter is included, the Yoko gave me 45.8 over 34,300 miles, and the Defender 43.1 so far over 5,548 miles, which includes winter mostly so far. Both tires seemed OK for winter driving. When the snow gets over 5", I stay home anyway.