Yes they do!
I've got 2 teen boys 19 and 17.
DS1 has just moved out, about 8 weeks ago, to join the Army. Before he left he never stopped eating. He ate all the time, a 6 pint bottle of milk was drained in a day. I should have bought a cow! Cereal, toast, yoghurts, fish finger sandwiches at midnight as snacks on top of his meals. DS2 eats quite a bit, but nothing like DS1 did!
They both had part-time jobs from the age of 15/16 so they bought quite a lot of their own clothes, bit obviously we still bought some. They have been in adult sizes since they were 12. DS2 had adult size 6 feet at 9!
We paid for their driving lessons as we live rurally. When DS1 wanted to go out at night we took him and paid half of the £40 taxi fare back, because we didn't fancy a 4am trip out.
We paid to put DS1 on the car insurance for 2 years because I am disabled and DH is in the Forces,so we needed an extra driver. Now DS2 is coming up to take his test, he has saved most of his wages so is buying a car and we're helping out with the insurance. The way we see it, a bus pass for school is £499 and we'd still have to get him to work, etc so its not that much more.
This time next year he'll be off to uni hopefully. The food and electric bills will go down, because teens don't open blinds and forget to turn lights off, but we'll have to help him out there too!