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Original post by: Dgray ,

Text:

The Michelin website gives you a number that is "indexed"

In other words a tire rated higher than the indexed number will be less fuel efficient.

So if the Michelin is rated at 100, and a Continental is rated at 105,  the Continental is 5% worse than the Michelin.

Also if the number was 95 for instance, it would be 5% better in fuel economy.

To calculate the true difference you would need the true rolling resistance coefficient.

Check with a quality tire dealer, they can help

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