Six weeks on one tank - Week 1

Week one has not gone as well as expected. Well, technically I'm 10 days into this experiment, and I'm over my permitted usage for the week. My tank stands at 5/8 today. I had a business meeting in which I had to travel about 40 miles round trip, along with some other errands that ate up my tank. At this rate, I'm barely going to make it a month. It's important that I try to group all of my business and personal tasks into as few trips as possible, eliminating inefficient and/or redundant trips. Pimping out my routes using Eulerian circuits would help, too.