[j_baker]

It's important to verify your intuitions, and it doesn't have to be a grand science experiment or a research project. If your intuition is that there are a lot of silver cars, a good place to start would be remembering the last time you saw silver cars. Or you could pay attention to the silver cars you see and take notes about the details that you feel are relevant. If it's worth it, then you can do a more in-depth analysis.

Now that said, there's not really much wrong with making broad assertions about the number of silver cars you're seeing without a more in-depth analysis. Chances are, nobody will care if you're wrong. There is something wrong with making a broad claim about things other people are doing without at least a little bit of evidence to support what you're doing. Just giving a list of search results and expecting others to find their own evidence isn't the best way to go about doing that.