0.02 micron filters will filter out everything including viruses. What about water that has been contaminated by gasoline or oil?

If you were somewhere you know to have gasoline pollution (anywhere people go boating, for me Lake Powell would be a good example, especially because people fuel directly on the lake) or if you found a water source but could see a fuel sheen, would you feel comfortable filtering that water for drinking?

Anybody with a good knowledge on how this stuff works?

Dissolved chemicals are not removed from Water the same way bacteria and viruses are.  I believe you will need a portable reverse osmosis system to remove dissolved chemicals.
Remember a chemical is molecular sized contamination. Waaay smaller than the smallest virus.

This is exactly the kind of information I was looking for. Thank you for the chart.