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First, there is technology triangle involving treadwear, traction, and rolling resistance. To get great values in one area, one or more of the other areas has to be sacrificed. You can see this as the BS B381 is only rated as a 260 treadwear, but is known as one of the best for fuel economy.
Second LRR is a relative term It means good fuel economy compared to other tires with similar traction and treadwear characteristics. For example, the Michelin Defender has a UTQG rating of 820 AB, where the BS B381 is rated 260 AB, but both are LRR = the Michelin will consume fuel than the BS, but deliver more miles before being worn out.
Now since you are planning on driving this car back and forth on a highway (and I assume that means plenty of miles), you probably want to make the tires last until you graduate. A tire with a 260 treadwear rating is probably not going to last long enough to get your diploma.
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