25 gallon tank getting 8 or 9 MPG -- I also start watching the signs looking for a likely station when I get to 1/4 tank.
We took our first 4k mile trip this summer and even with stopping roughly every 200 miles, I only got forced into a tight spot once when I could not make it through a heavily built up suburban area.
I look at it this way -- 99% of the goods / products we use / consume everyday get delivered buy tractor trailers averaging about 70 feet in length. If they can get in there to deliver the fuel, Coke and Doritos, then I can drag 35 feet of TT in to do what I need to do....you just need to practice and get comfortable handling your trailer, and then watch out for the cars / pedestrians.