As I mentioned in post #23 above, I hiked the AT with a partner who easily spent twice as much on food as I did, even though we shopped at the same stores and ate in the same restaurants and had as much fun. I wasn't a miser and he wasn't a spendthrift, just above below the average. I did not drink coffee or alcohol on the AT, and that makes a difference. My friend also enjoys expensive restaurant desserts and I don't.
You can spend a lot of money without being really frivolous, and I can see how your food costs could easily be twice those of Texaco's (and mine, since mine were nearly exactly his).
A lot of my resupply would be a mixture of rolled oats, raisins, and walnuts, bought in larger boxes/bags and mixed in ziplocks on the bench outside the store. For $10 I'd have four or five days of muesli, roughly half my calories. The rest would be $15 worth of cheese or PB, tortillas, nuts, crackers, and some fresh fruit and veg. My partner would buy lots of packaged muffins at several dollars each, boxed cereals, higher-end crackers, honey, small quantities of different types of nuts and berries, cured meats--the same calories but costing more. Both of us went stoveless and our hiking styles were very compatible--meals took the same amount of time and we liked to stop at the same times and eat about the same amount.
I had the money to spend. My hike came in way under budget, both time and money. I just didn't see the need to spend more money on food--it just didn't matter to me.