Is it worth using Techron in a new car? My assumption is that it should keep it clean when there are few or no deposits easier. I usually only use top tier gas anyway.
Then you don't have any need for Techron, period, and
especially not on a new car.
Does anyone think that stuff actually works anyway?
Techron concentrate does work. It's basically the same additive that you would find in Top Tier gas, but more concentrated. It's not snake oil unlike many of the other fuel additives out there.
If your car has been run on Top Tier gas its whole life, Techron is unlikely to provide any benefit for you. But for a car that has been neglected and run on cheap gas, Techron can clean the injectors and valves (on a non-DI engine). On a DI engine, Techron won't be able to clean the valves.
Remember to change your oil shortly after using Techron, as the contaminants it "cleans up" will end up in teh oil. The best time to use Techron is on the last tank of gas before an oil change.