I am only talking about our idine spending - restaurants. Due to the nature of my DH's job we are able to utilize idine as much as possible. Our idine spending is about 3000-4000 a month that gives us 15% = $400-500 cash back. Or will give us around 15,000 miles, if we switch.
Besides “business” idine, we are not big spenders, so our personal spending a month is pretty small.