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no real difference between 'skinny' and normal tires. stay w normal. But you need to look at the over all gearing as mentioned above.
Taller tires (than stock) can lower rpm at highway speeds. how much time on freeway or in top gear.
Also all engines have a sweet spot in the rpm curve. I got my 02 Infiniti Q45 V8 to around 1700 rpm at 65. Really helped the milage. Went 5.5% taller on the tires.
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