Yeah, a $12 entrée is pretty average for a single meal. Add anything else (tips, drink, etc.) or pick anything slightly more expensive and you'll easily hit $15. If you go for inexpensive options consistently (maybe you avoid tips and always get water at a cheaper place), you could probably average around $9-$10/meal, though you might get tired of it quickly. To average less than that while still eating out every meal, you'll have to get a bit more... creative with your selections.