NEW YORK (TheStreet) -- Denny's (DENN) - Get Report CEO John Miller is optimistic the restaurant chain will continue growth in 2015. Earlier this week the company raised its fourth-quarter outlook and full-year expectations.

At the ICR X Change 2015 conference in Orlando, Miller said improved job figures and two-income families are going to enjoy their windfall by dining out more often.

The drop in oil prices has put back about a billion dollars a day into the economy. That has to be helpful to all retail and restaurants in some way or another. Historically, "there's not been a correlation to higher or lower gas prices to dining out," Miller said. Sales at the company's restaurants open more than a year grew 4.7% in the fourth quarter, its biggest increase in more than eight years.

The company has 1,704 stores, with 106 of them overseas. Denny's opened 38 restaurants last year and six international restaurants. Denny's refreshes its menu every quarter, Miller said. Diners can expect to see more Skillet creations and other new items and new flavors along with the return of some favorites.

-- Written by Anthony Buccino in New York