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If all you are interested in is fuel economy, stick with the OE tires (the ones that came on your car) IF they are still available. Usually OE tires are reverted back to their regular specs when the vehicle manufacturer no longer sources them, so it just may be that even though the tires are the same make and model, they may be different.
But if fuel economy is but one of your interests, you have to decide what compromise you are willing to make. There is a technological triangle involving fuel economy, traction, and tread wear. To get better performance in one area, one or both of the others has to be sacrificed. You need to chose which is most important.
Also, the term "LRR" means "better fuel economy compared to other tires with similar wear and traction characteristics." It does NOT mean an absolutely low rolling resistance value. So a tire labeled LRR might actual be worse for fuel economy than ones that aren't so labeled.
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