That's $50 total, but it's also the minimum I'd plan for. That plans for $15 a day each for restaurants and $10 other food. That's watching things quite closely, however, and it wouldn't be bad at all to add even more into your plan.

I'd also just tell you to be a bit careful in your planning, because things tend to take a lot longer than they do on paper. If you are planning for a day where you aren't stopping until after dark (during summer days when you've got daylight until 9pm or so), a slight delay could mean you aren't off the road until after midnight or later.