(Hyper) miling LS500H

Hello all,
The LS500H isn't a very popular car (compared to the regular 500), and so my question is: Is there anyone out here who has a 500H and got better gas mileage than Lexus' EPA figures? And if there is anyone with a kind of buyer's remorse, what reasons would that be? I am a conservative driver, currently having a 2018 Avalon hybrid in the household, giving me 42 mpg average after 18 months of ownership. I really like the 500H