this year i got to my folks about 50 miles short of steamboat on $350
This is a quote from Dave N. in the Breckenridge grocery store the weekend of the Firecracker....
"Sweet, 1,000 calories for 99 cents!!!" (Animal crackers)
On a related note, I toured for 2 months one summer and budgeted $8 per person per day (my bro and I). Keep in mind we paid for camping/hotels only once and it was $5, so the $8 was really only for food and we certainly were not racing, so ramen, oatmeal, and peanut butter were our standards. If I was to do it again with an emphasis on speed rather than my wallet I would guess $40-$50/day would be a good place to start.
Afterall, I still can't eat ramen...