To check your Exxon Mobil card balance, follow these steps:
Visit the Exxon Mobil website.
Log in to your account using your username and password.
Navigate to the account or card management section to view your card balance and transaction history.
Checking your Exxon Mobil card balance helps you stay on top of your finances and monitor your spending.  By reviewing your balance, you can make sure you have enough funds available for your fuel purchases.