To make it lighter, talk to your Trek shop to see about doing a Ghetto Tubeless Conversion.
Also (on the cheap), you could possibly cut some of your seatpost. The bontrager ones are usually very long.
If you don't use, or don't think you'll use your inner or outer chain ring, convert to a single chain ring and get rid of your front shifter, front derailleur and cable.
These small changes will be cheap and save a little weight.