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Those who toute the comparative fuel consumption and pollution reduction advantages of one mode of transport (rail, air, water, highway, etc.) compared to another might want to keep the following phraseology in mind.  It is taken from the Transportation Energy Data Book that Amtrak references. "Great care should be taken when comparing modal energy intensity data among modes. Because of the inherent differences among the transportation modes in the nature of services, routes available, and many additional factors, it is not possible to obtain truly comparable national energy intensities among modes. These values are averages, and there is a great deal of variability even within a mode." The data book provides limited information on the statistical methodologies used to determine the outcomes, but it is silent regarding statistical confidence levels, ANOVA outcomes, etc.  It is possible that the differences between the modes, especially where the differences are relatively small, are a function of statistical chance.
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