Volume of mp3 export

When I export my finished story as an mp3, the volume on the speakers has to be turned up to maximum or near maximum to equal the volume of the original Audacity file before export. The same is true for my car volume if I stream it in the car. Is there any way to make the exported mp3 play at approximately the same volume as the Audacity file?

What happens if you launch Audacity and import the MP3? Does it look and play correctly?