Does mantle use ETH for gas?

I'm curious about Mantle's utilization of ETH for gas. Given the importance of gas fees in the Ethereum network, does Mantle actually employ ETH as a means of payment for transactions? If so, how does this fit into their overall business model and how does it impact the user experience? Additionally, I'm also interested in knowing if there are any alternatives or substitutes that Mantle might consider using instead of ETH for gas, given the fluctuations in the cryptocurrency market. Understanding these details would help me gain a clearer picture of Mantle's operations and their strategic approach in this realm.