Hello and Welcome ... Sounds very much like you have the SX model...There would be no economical way of adding the missing Hyundai trip computer function to your car (as far as I am aware)
There is however, an after market add-on called a scanguage which will give you that functionality and more but you do need to be a bit mechanically minded to use it to its full potential (there is also another similar product other members have mentioned)
I don't have either but you can (a) wait for others to come on and tell you more, (b) use the search button at the top of the screen to search for info on here or (c) Google scanguage for more info and pricing...
There was some feedback at one stage about issues using the scanguage with an auto (but these might be fixed now?)