Maps and Data
Find maps and charts showing transportation data and trends related to alternative fuels and vehicles.
Fuel Economy at Various Driving Speeds
| 45 | 55 | 65 | 75 | |
| Midsize Car | 39.1 | 41.7 | 36.9 | 31.9 |
| Small SUV | 32.5 | 34.3 | 29.1 | 24.5 |
| Large SUV | 29.5 | 30 | 23 | 19.8 |
| Midsize Diesel Car | 56.4 | 57 | 47.9 | 40.2 |
| Large Diesel SUV | 43.6 | 39.9 | 32.5 | 26.9 |
| 2000 Insight HEV | 101.3 | 94.3 | 80 | 60.6 |
| 2004 Prius HEV | 72 | 66 | 57 | 42 |
Source: Oak Ridge National Laboratory Transportation Energy Data Book #30, Table 4.27.
This chart shows how fuel economy varies with driving speed for various vehicle categories, as modeled by Argonne National Laboratory's Powertrain System Analysis Toolkit (PSAT). All conventional gasoline vehicles (and the midsize diesel car) achieve their best fuel economy at 55 mph. The selected hybrid electric vehicles (HEVs) and the large diesel SUV achieve better fuel economy at 45 mph than at 55 mph.
