In fact, you should never buy or sell stocks based on any single sentiment indicator, whether it is our survey, the State Street Investor Confidence Index or the Investors Intelligence Advisors Survey.
Although it would definitely be useful to know your car's fuel mileage (a decline in miles per gallon is a good indicator of potential problems), I'm not dedicated enough to enter every single gasoline purchase.
This is one advantage over the Conference Board's leading economic indicator, which conceals useful information by combining longer- and shorter-term indicators in a single measure.