The comparison site claims that diners saved £3bn last year by redeeming online vouchers for meals in restaurants in the UK.
The research says the stigma of using a discount coupon has reduced and that 60% of consumers now regularly use the promotional vouchers.
In the past year, the number of consumers using online vouchers in restaurants ahs risen by 30% and consumers use a voucher once a month on average.
High street restaurant chains Pizza Express, Pizza Hut and Zizzi are the most popular restaurant vouchers.
Pizza Express has offered a selection of e-coupons since the onset of the recession offering buy one get one free on selected menu items, second main meals for £1 and set menu deals including a starter, drink and main meal for £10.
The research found that 22% of consumers refuse to go to a restaurant that doesn’t offer discounts and 50% check for deals before eating out.