Yesterday on my way home I watched as the fuel gauge slowly drifted down past the halfway mark. As a general guide, I like to believe that it'll be a good tank with good mileage if I am able to get 250 miles as the needle passes the halfway mark.
As the gauge hit the halfway point yesterday, the mighty Corolla had gone 267 miles. This bodes well for the overall fuel economy of the tank.
Of course, there are many other factors that con potentially have a negative effect on the rest of the tank. I could sit in 80 minutes of traffic over the next two days, instead of the averages of 57 minutes for Wednesday and 69 minutes on Thursday (although I will leave at lunch time on Thursaday and ought to avoid heavier rush hour traffic).
At the current rate, I'll refuel on Monday, August 6, giving me an eleven day tank life.
Please enjoy this drawing that has no relation to this post: