Does putting ads on cars help get a decent amount of traffic to justify the fuel costs+ad costs? I'm considering doing in the next couple of weeks when I launch a white hat site. I found that I could get 2 12"x24"(30cm by 60cm) magentic banners for only $52. My fuel costs are also about $0.038 to $0.042 per mile now, due to lower gas costs and since getting a prius, compared to about $0.165 per mile about 2 months ago. Is it worth spending getting the ads and just drive around more often, so that I could get the website name out, or do people not pay attention to ads on cars?