Im on the motorway most of the time to and from work, where I will drive relatively relaxed, although it is stop/start sometimes.
Hopefully, by the end of the week I'll still have some in the tank to burn

I do around 280 miles a week, and as long as I get at least a full weeks worth out of a single tank, I'll be happy

On another note, how much does it roughly cost to fill the tank these days??