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Just to reiterate a piont:
LRR is NOT an absolute term. It is a relative term. It means "better RR compared to tires with similar wear and traction characteritics".
In the OP's case, his Dunlops were LRR with a UTQG of 320AB, while his replacement Yoko's were LRR, with 800AB. These are NOT comparable in any way. All other things being equal (for example, inflation pressure), the OP should experience a drop in fuel economy.
However, the inflation pressure has been raised from 44 psi to 50 psi, so exactly what F/E effect the new tires are going to have is difficult to say - too many variables.
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