BZTguy,
. . . Many gas stations also sell non-alcohol fuel for a few cents more than regular. Farm communities have these stations. Aviation fuel is also good to use, just costs more.
Ed

Excellent advice.
Boat yards/storage-areas also often have non-alcohol fuel.
SUNOCO sometimes has it more often than other brands?
If you are on a long trip, do not worry about it (too much). The problem is if/when your truck is inactive and the gasoline "sits" for long periods.
Also, be careful with new fuel-injection lawn mowers - non-alcohol fuel is required (and often, running the fuel until empty is required).