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I installed a set of Bridgestone Ecopia EP422 tires on my Mazda3 a few months ago. I "believe" they are a LRR tire which should help a little, but I haven't been doing enough driving to really tell yet, thanks to The Virus from China.
I did increase the already tall legs of my Mazda3 a bit with the new tires, going for 20565R16s to replace the factory's 20560R16s. This bit of extra circumference slowed my RPMs down by around 3%, which theoretically will yield a small increment of fuel economy, but probably not measurable except under laboratory conditions.
With the new tires, my 2.0L engine is now turning at about 1670RPM at 60MPH, compared with about 1720RPM before. Slower RPMs generally helps fuel economy by reducing the level of internal engine friction and allowing the engine to loaf a little more, as long as, however, the tipping point isn't reached where the extra load from the slower engine overcomes any benefits from the fewer revs per mile.
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