For mileage improvements you probably should be looking at a "Grand Touring" tire, some of which do have low rolling resistance versions. Both Bridgestone and Michelin have them. How much of a difference they make is harder to say. Just keeping tires properly inflated and driving reasonably does a lot for tire life and fuel mileage.
But how real are the savings with an LRR tire?
if you average 25 mpg on "normal" tires for 12K miles you use 480 gallons of gas.
if you average 27 mpg on LRR tires for 12K miles you use 444 gallons.
So you save about two tanks of gas a year. Not bad, $140 or so.
But as they say, YMMV.
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