First 9 days of 2023 with SPY = +6.63 6.63/387=.017=1.7% ***Start with buy @ close last day of Dec. 2022. ***387 = average price of SPY for 1st 9 days.
Long Volatility at the close. Sell Volatility at the open works better on most days. The market settles down after about 10:30 am and Bid/Ask spreads usually get tighter throughout the day.