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So that's about a 13% reduction in fuel economy.
Things to consider:
New tires always get poor fuel economy until they wear in a little.
Measure the circumference of the new tire vs old. A larger circumference will under-report distance travelled and throw off speed and MPG estimates.
Certainly the non-LRR tires resulted in a reduction in MPG, but I find it difficult to believe 13% less. I would think different tires would account for only a 5% or less difference.
Factor in the fact that you'll have to replace the tires more frequently. That's a big cost that could offset fuel savings.
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