Usually about $40, but depending on how many miles I've driving a day, it can last me a couple weeks or more. I live pretty close to where I work, and pretty much everything I need is in a pretty close area within where I live too, so I don't need to drive super far for much (and could walk if I really wanted to). I do make further drives a couple times a week though and as needed for work, but a couple weeks is usually my average before I have to go to the gas station to fill up.