Dota2's Data Usage

Cost  Exactly as Much As You Play

Limit your computer's updates

You might cost a lot of data when playing dota2.It can happen in common ,cuz of your computer's updates. You can choose not to download updates in windows settings or by limiting this updates  using a limiter software. Net Balancer and Net limiters, I suggest. Both are paid softwares but Net Balancer can still limit 3 app after the trial period. Limiting 3 properties is enough to make your dota2 cheaper .

Download The App here    
https://netbalancer.com/download
You have to block svc host or maybe other things you see that is downloading a lot of data.And block steam client webhelper too. But, you can't browse internet from steam ,if you block webhelper.
That is quite enough for out game.

Close Dota2's Offical Website

U have to close dota2 official website by writing a command in the host file. The direction of host file is here -

                   C:\Windows\System32\drivers\etc\hosts

Open it with notepad and write

 127.0.0.1 www.dota2.com      at the bottom of it.By  closing dota2 website, you can only see blank spaces in ads box . And it won't download any data that not deal with game.

In Game Setting

You have to disable all advanced setting .(You can check shadow and set the texture to 100%) 

Set the audio to off.(It will mute hero's voice and announcer)

Enable console in hot keys option and get the console by typing " \ " in default .Write -

"cl_updaterate 20"

"cl_cmdrate 20"

and "rate 40000".

                              

               Good Luck....