The table seems helpful to identify on which time and day the network has been less used. If you are saving for gas fee you must target those days that it is very low. Eth gas fee sometimes surge but in the table we can somehow assume which particular day to use it.
The table shows brightest days are Saturday and Sunday but honestly, I try to find what time zone is used for the table and I can not find it.
I am not sure what time zone is used here for their information presentation.
Their information on
About this ETH gas data points to Gasnow.org which is non existing website.
About This ETH Gas Data
The charts above use the “standard” gas price given by gasnow.org. It is recommended that users who are going to transact on Ethereum check gas prices before doing so. The heatmap calculates an average of these standard prices for each 1-hour window using data from the previous two weeks.
There is only
Gasnow.io that has no information about used time zone too.
That site has some more information than Milkroad.com and even has an extension I will not install it, only visit the website to get information I need.