If your car is more than 15 years old or so, yes, you do need to tune it up. That includes adjustments of parts that newer cars don’t even have, like the carburetor, and replacing spark plugs and the condenser as they wear out. Spark plugs in newer cars, meanwhile, last for up to 100,000 miles.
If you want to keep your car running efficiently and prolong its life, consult the maintenance schedule in the manual and do what’s recommended unless you have a compelling reason not to. Don’t visit your mechanic and ask for a “tune-up” unless your car is of the proper age, unless you want to broadcast that you don’t know what you’re talking about.