Trends Away From Efficiency

A simple equation can help explain America's increasing use and dependence on oil: (stagnating fuel economy) * (increasing miles traveled) = (rising petroleum use).

Fuel Economy Improvements Have Leveled Off

Source: EPA's Light-Duty Automotive Technology and Fuel Economy Trends 1975 Through 2005

Despite technological improvements, overall fuel economy has stagnated. This is largely because automakers have eschewed fuel economy for power improvements, especially in the immensely popular pickup truck and SUV market segments.

Americans Keep Driving More

Source: FHA's Highway Statistics Table VM-1 (passenger cars plus single-unit 2-axle 4-tire trucks)

The increase in population over the same time span does not nearly account for the rapid increase in miles driven.

Overall Change (30 Years):
Population up 38.4%
Vehicle Miles up 142.6%

Source: Census Bureau

Growth in Miles Driven Outpaces Population Increases

Source: FHA's Highway Statistics Table VM-1

Thus, vehicle miles traveled per person has increased substantially.

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