http://priuschat.com/forums/freds-h...art-explain-peoples-silliness-gas-prices.html Already posted at above.
You can use it to explain people's silliness with almost anything. There's an xkcd for (almost) every occasion. This is my desktop image at work: http://xkcd.com/664/
At xkcd . com, there's a new info chart, this time about money. Here's the vehicle section, zoomed in. Each square represents $1000. So the Prius cost is 38700 total - 5000 fuel = 33700 car cost, all options, I guess. The fuel cost proportions are interesting. Click the chart at his site, to get a zoomable version. Lots of different subjects are covered, and they all show in proportion by units of dollars, thousands, millions, billions, and trillions.