Every now and then, readers write to grumble about new cars and their gas mileage. The gist is usually something like this: You wrote that the new 2011 [Make & Model] gets 40 mpg highway? Well, big whoop-de-doo. I always got at least 45 mpg in my 1992 Geo Metro, and it was a whole lot cheaper, so how can you say we're making progress? The most...
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