I think another factor to consider is Safari usage patterns.
If you read a web page for 15 minutes before navigating to a new one, you are going to use much less battery when compared to someone like myself who basically skims over 30 web pages hourly.
If you read a web page for 15 minutes before navigating to a new one, you are going to use much less battery when compared to someone like myself who basically skims over 30 web pages hourly.