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Fuel economy at steady speeds: average of 9 cars and light trucks, 1997 study

The 9 vehicles did best at 50 to 55 mph, with 32.4 miles per gallon. At 75 mph they got 24.8, 23% less: about what they got crawling at 15 mph (24.4).

What does this axis measure?
What does this axis measure?
Fuel economy at steady speeds: average of 9 cars and light trucks, 1997 study: 13 points, a line chart.
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y ↑
Fuel economy (miles per gallon)
x →
Driving speed (mph)
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The data: 13 points
Driving speed (mph)Fuel economy (miles per gallon)
1524.4
2027.9
2530.5
3031.7
3531.2
4031
4531.6
5032.4
5532.4
6031.4
6529.2
7026.8
7524.8
Source
Federal Highway Administration study FHWA-RD-99-068 (West and others, 1999), as given in Table 4.34 of the Transportation Energy Data Book, Edition 40 (Davis and Boundy, 2022). Courtesy of Oak Ridge National Laboratory, U.S. Dept. of Energy
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No licence named; Oak Ridge National Laboratory states it will not assert its rights and asks for the credit line
Read
2026-10-06
Drawn
13 points as the puzzle showed them · line
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