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I've done a lot of research on LRR tires and I have tried a lot of the newer models. I also receive great feedback from other users on my other forum. As such I highly recommend the Energy Saver A/S for the best mpg AND the lowest cost per mile assuming you get the $70 rebate from Michelin. It simply offers the best mpg in any tire in this size range. In testing with the Prius, both new and old, the Energy Saver A/S offers 2-3mpg better efficiency! I have personally tested a 3+mpg difference between the Energy Saver A/S and AVID Ascend. I do not see them in a 205/55/16 soooo.
I would suggest looking at the Yokohama AVID Ascend (T) with it's 80,000 mile warranty and great fuel economy and good handling. The mpg is similar to the OE tire on the 2010-2012 Prius (AVID S33D). The Michelin Defender is untested in terms of fuel efficiency but it does carry the GreenX label (which doesn't mean much IMO) but it is affordable with the $70 rebate and it offers a stellar 90,000 mile warranty. All of these choice would be better in terms of fuel economy than the Continental ProContact with EcoPlus although this is a great tire are a great price. Cost per mile tends to be higher than the aforementioned tires, however. The Bridgestone Ecopia EP422 is a great option for cost per mile but the traction is lacking compared to the other tires listed above. mPG is better than the rest except for the Energy Saver A/S.
I have performed various reviews on the tires I mentioned including the Primacy MXM4. You can find them on Priuschat by doing a google search like "Yokohama AVID Ascend Review".
Just remember, just because the tire is labeled LRR doesn't mean it is as fuel efficient as other LRR tires.
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