H1B extension

I have applied for my H1B extension and it has not yet been approved so far. It is in ‘RFE response review’ status. Its my 8th month stay in US and 4 months since my visa expiry. I heard that i need to leave US after 260 days of my I94 expiry. After i leave US and if my extension gets approved after i go back to India, can i come back to US with my approved petition?

I think you need to exit US if your extension is not approved util 240 days from I94 expiry.

As far as I know, the I94 extension filed with your H1B extension will be abandoned when you leave the country. So, if you have to exit US, you need to go for VISA stamping to your nearest consulte in your home country with the approved petition to re-enter.