According to BatteryUniversity discharging to 50% give 1200 cycles instead of 300. So, it doubles lifetime mah (200%).
Charging to 4.1 instead of 4.2V gives 600 cycles at 86% of mah, increasing mah by 172%. It is a bit less than 200% at half discarge, but 86% of charge will lasts longe, no need in too frequent charging.