The 10 PSI makes a big difference, lower rolling resistance, higher amounts of grip to turn at speed which also means you can carry a higher speed (plus less body roll if you turn hard), easier to accelerate to target speed. I remember when my dad 'pumped' my tires to 32 PSI when they were previously at 50. The car would vibrate and take longer to get to the speed i wanted, not to mention my glides were horribly short. When i pumped it back up, the vibration went away and my glides went back to normal.
Tire pressure makes a big difference especially if you pulse and glide.
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