A route 44 drink has about 8 ounces of actual soda in it. I drank mine really fast one time and poured the remainder(less then half full) of my 20 ounce pepsi into it and it filled it up plus some left over. DO NOT waste money on sonic drinks.
I don't specify, they are the only Fast Food joint that actually mixes their soda water & syrup well enough I can stand them. That Coke flavored water Mickey D's & BK pass off as soft drinks is just awful and I can't believe that people have been conditioned to accept it.
Sonic does go overboard on ice but I like my drinks cold so it doesn't bother me but I have family that will request "easy on the ice", "light ice", "half ice", etc. and they are always oblige.
I like to get a Strawberry Limeade Route 44 and when its gone(about 3 good gulps) I fill the cup with Red Diamond sweet tea. Tastes great with the strawberries and limes in it.