Mandatory tipping? Is that a thing now? I don't believe in it. I always tip if I feel it is deserved and most of the time it is. I tip my grocery and Walmart deliverers at least 15%. If my bill comes to more than $150 I'll tip 20%. Restaurants I'll tip 20% unless I get bad service, then I'll drop it to 10%.

I usually don't tip drive-throughs.