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Why not just start recording from the git-go. If there is a break in period, you'll discover it. If not, you won't.
Besides, in the long run, a new tire gets worse fuel economy than an old one - all other things being equal. That is, as a tire wears down, its rolling resistance get better.
And don't forget, that LRR means "lower RR compared to other tires with the same traction and wear characteristics". So some LRR tires don't have low RR values at all - just better than their competition.
And some aren't even as good as non-marked tires!
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