Why does the bar graph for all cars in a specific car type not match up with the listing of individual cars and their mpg? For example, for the Honda Insight, I counted nine cars averaging 49.0 - 49.9 mpg. However, the bar graph for Insights shows only 2 cars averaging 49 mpg. Even if you round up/down, the figures still don't match up. How is the data for the bar graphs calculated?
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