1. Make sure you always talk to every npc all the time. After every mission sometimes a side mission unlocks. There may be an npc that has missions and then all of sudden it'll pop up. So always go back.
2. Job boards: check out the job boards after every mission and sewer you complete.
3. Search for plants in the wasteland. These plants will help you to get full health upgrades.
4. Race. Make sure you race. Racing is a huge part of Rage and it's fun.
Just a few things that I noticed some people are missing.
Add a few if you'd like.
