You can cut your tire wear in HALF by cornering on two wheels... <--- just kidding 
On our '06, we got 45K miles on FIVE OEM tires. Got 55K on the FOUR replacement Yokohamas. Got another 50K out of four Kuhmo 727s.
We only had one alignment at about 170K miles (the springs had started to sag a bit)...the alignment mitigated the tendency of the treads to 'feather' and become noisy.
On our '06, we got 45K miles on FIVE OEM tires. Got 55K on the FOUR replacement Yokohamas. Got another 50K out of four Kuhmo 727s.
We only had one alignment at about 170K miles (the springs had started to sag a bit)...the alignment mitigated the tendency of the treads to 'feather' and become noisy.