Once you know how far you can go on a half of a tank of gas (you need the other half a tank to get home), you can then look at a map to see how far you could go. You may want to stop a bit short, just incase. Make a circle on a map going around your town so you have your options in all directions laid out for you right away. You may already have an idea where to go for your one tank trips, but this helps if you really have no idea. You may be surprised to see how far you really can go for a trip on one tank of gas, even with prices as high as they are at the present time.
Though you may have to take one tank trips because of the economy and current prices, you shouldn’t feel as if you are missing out on anything.