Funny I made the same comparison that you did. I too had a bag of Doritos on my counter and wondered at what point would I stop buying them. I would have to wonder if $5.00 for a bag is not that far off.
They have been predicting the highest gas prices on record will be not that far off, and in just a few months my area will hit the $5.00 mark. My consumption is small since I office from my home , and only use my vehicle about once a week for grocery shopping and errands. I am thinking about letting my close neighbors know when I am going so its more than just me going to the grocery store.
I am so concerned that this bit of hope we have seen that the economy is on the mend may all vanish.
On another note there have been some great on line fabric sales with free or greatly reduced shipping, so I am doing some stocking up.... like I needed an excuse.