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    Efficiency ratios

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    Petroleum consumption in the US in 1990 supplied about 33.7E15 kJ of energy. Of this quantity, about 15.9E15 kJ was supplied by foreign sources. The transportation sector is the major user of petroleum, accounting for 23.2E15 kJ of consumption. Overall automobile fuel economy in the US was about 21 miles per gallon in 1990. Automobile efficiencies in Europe and Japan were about 27mpg. If the US had averaged 27 mpg in 1990, how much less petroleum (expressed as kJ) would have been imported?

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    Hello and thank you for posting your question to Brainmass.

    The efficiency of the europian cars over the amrican cars is:

    e = 27/21 = ...

    Solution Summary

    The solution shows how to find th new consumption amount of fuel if the efficiency of US cars increases.