My installation is about 1,2 GB. I didn't download all assets. I always download only the cars and tracks that I need at the moment. And I reinstall the game from time to time to spare some storage space.
Delete and reload will often reduce the footprint (don't forget to cloud save) as updates don't seem to clean up properly. This might be device specific.
The previous comment is probably the most useful, if you are short of space on your device then don't download all the assets. If you aren't running a lot of the cars or series this will save you quite a lot of space.
Thanks so much everyone. I was haveing storage issues also did not no what to do. did not realize you could uninstall and reinstall by save stuff in cloud. Long time player you guys are always so helpful . Thanks everyone for your input.