In a market with cheap, plentiful gas you can shout "FUEL ECONOMY" at people until you are blue in the face, or broke, and they won't care. Looking at the car market research from a year ago finds fuel economy fifth or lower for buyer importance. Now it's first, so the advertizing changes to reflect it. 3 years from now the focus might be elsewhere. We'll have all these great cars getting good mileage so the selling points willl switch to cabin technology or size or power. The direction of advertizing doesn't appear out of thin air, it's based on millions of $$$ being spent on market research asking the people what they WANT and then trying to make what you have for sale fit that desire.
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