Plantagenet wrote:The first thing we will notice is a jump in gas prices.
This has already occurred --- gas prices jumped after 2005 when conventional oil production plateaued
This. Price signals are the only things Americans really notice (I'm assuming the OP is American, correct me if I'm wrong).
We can argue about peak oil's role in the Great Recession (small, I think), but the current historically high plateau of oil prices is THE sign that peak oil is now. I think this price spike acted as a catalyst of sorts for the Great Recession, and has played a smallish role in the rather lackluster (i.e., non-existent) "recovery" we've enjoyed thus far. But peak oil wasn't the primary cause of the crash.
There's still gasoline available at every station in the US/Europe/et al., albeit at a rather high price, but not high enough to stop recreational driving (only limit it slightly). Once we start on the downslope of Hubbert's Peak, things will get far more interesting. Shortages, rationing, black markets, permanent economic depression, social strife, etc. See Egypt.
Only then will Americans as a whole start to become dimly aware of the concept of peak oil, but the troubles will likely be blamed on liberals or conservatives, environmentalists or oil companies, etc. I doubt peak oil per se will ever enter the regular mainstream conversation, it will be lost in the mess of the Long Emergency.
A garden will make your rations go further.