You got about as much improvement as I got (6.9 %) when I changed from regular to Energy Saver LRR tyres.
I didn't change from well-worn tyres though - which would have worked in favour of your old tyres.
The good thread depth should make 'm last long.
I'm starting to worry that my car will wear out before the Michelins do - and I have yet another set laying about.
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Strayed to the Dark Diesel Side
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