Historically I've been pretty bad about keeping my gas tank topped off. But I've been making a concerted effort to keep my truck up above half full. In the winter it's essential; one might have to run the engine for awhile or one might get stuck. Gotta have some margin for error.

Now that we have a Costco in Sioux Falls (yay!) I stop every Monday and top off.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman