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Transportation energy data book: edition 23 - Oak Ridge National ...

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The Environmental Protection Agency (EPA) tests new vehicles to determine fuel economy ratings. The city and<br />

highway fuel economies that are posted on the windows of new vehicles are determined by testing the vehicle during<br />

these driving cycles. The driving cycles simulate the performance of an engine while driving in the city and on the<br />

highway. Once the urban cycle is completed, the engine is stopped, then started again for the 8.5 minute hot start cycle.<br />

Figure 4.3. Urban Driving Cycle<br />

Figure 4.4. Highway Driving Cycle<br />

Source:<br />

Code of Federal Regulations, 40CFR, "Subpart B - Fuel Economy Regulations for 1978 and Later Model Year<br />

Automobiles - Test Procedures," July 1, 1988 <strong>edition</strong>, p. 676.<br />

TRANSPORTATION ENERGY DATA BOOK: EDITION <strong>23</strong>—2003<br />

4–29

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