# Calculating fuel economy gain from proposed gain in rolling resistance

I calculated my average rolling resistance for all 30 tires as 128. My proposed average will be 93. That's a 28% reduction. How do I take my average fuel economy of 5.7 mpg and calculate how much of a gain from the lower rolling resistance I should receive. Ps: I'm pulling super b 8 axel 60000 lbs empty 135000 - 140000 lbs loaded.

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