Word for people who eat out in restaurants/eateries

Is there one word for people to substitute "people who eat out in restaurants "?- whether in quick service restaurants, eateries, or high end restaurants. Terms used in business are preferable.

Diner: "someone who is ​eating a ​meal, ​especially in a ​restaurant"

http://dictionary.cambridge.org/dictionary/english/diner

plural: diners

business: clientele: "the customers of a shop, bar, or place of entertainment."

http://www.oxforddictionaries.com/definition/english/clientele

eater-out

A person who frequents restaurants rather than dining at home.

Neo-Words: A Dictionary of the Newest and Most Unusual Words of Our Time by David K. Barnhart

restaurantgoer/restaurant-goer

One who goes to or attends restaurants.

2009 September 6, Seth Schiesel, “All Together Now: Play the Game, Mom”, New York Times: Sure, the result won’t be of professional caliber (after all, you didn’t go to cooking school, the equivalent of music lessons), but you may have a greater appreciation for the genius who created the dish than the restaurantgoer, because you have attempted it yourself.

Wiktionary

Out of the dense formations of endless fast food chains, Simon's novelties were to titillate the jaded restaurant goer. The Land of Look Behind -Paul Cameron Brown

Random House

Consider

restaurant patron

a person who buys the goods or uses the services of a business, library, etc.

Merriam Webster

This is a very common business term as it has far reaching implications into other types of business, but when you're at a restaurant, patron is very commonly used to refer to the ones eating there.