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2007 Altima 3.5 SL

Hi guys, got a few questions here. I just bought 2007 Altima 3.5SL preowned from a non-nissan dealership.

1. Is it true that premium unleaded gas which is recommended for this car can save more gas rather than the 87 AKI regular unleaded which is allowed to be used according to the manual?

2. The CVT (continuous variable transmission)has a delay on acceleration when shifting from neutral to drive. Is it normal? Also, when shifting gear from P or R or N or D, I feel a bump. Are these normal for CVT type of transmission?

3. Shifting from D to N while waiting in red light. Is it saving gas and let the engine rest or is it ruining the transmission and waste more gas considering the CVT type of transmission?