tune up on 2004 Chevrolet Impala

At what mileage should I get a tune up?

Asked by for the 2004 Chevrolet Impala
You can find the complete factory recommended maintenance schedules for your car on Repairpal:

The services included in these schedules encompass everything needed for a tune-up, which doesn't really exist any more.
1 more answer
See your owners manual for the maintenance schedule.