Yeah will try this out.

So do McD, Pizza Hut, and KFC. The all have a limited range for delivery. Easy to forget if you live central.

Papa Johns delivers also. Never ordered delivery, but would expect it's within 2nd ring as it's located in Wangfujing.

Delivery is usually about 3km for these places, and not as the crow flies. When you consider that modern city blocks are 500m long/square, you realize the 3km is not distance at all really.