I can speak to personal experience on this problem. My closest actual grocery store? 3 miles, one way. When you're packing 4 pounds of chicken, at least 5 pounds of beef, a gallon of milk, about two pounds of cheese, a dozen and a half eggs, a pound of butter, never mind everything else... it's just not walkable. Especially in the 90+ heat and 65+% humidity like we're dealing with this week.
Did I mention we live right off a 45 mile per hour highway? because there's that, too.