Originally Posted by
dolcevita
Sonic has a drive-through? The ones I've seen were all drive-ins.
No service - no reason to tip. Keep the change, perhaps, especially in cold weather, but I don't see an obligation.
Several Sonic's where I live have drive throughs in addition to stalls. We have one Sonic though, that due to opposition from neighbors about possible noise, doesn't have any stalls at all, but you either use the drive through, or park and go into the building to order - just like at a normal fast food restaurant.