Driving Experiment
In addition to the data collected for two years when the converted plug-ins were driven by Google employees, RechargeIT set up a controlled test using three conventional gasoline vehicles, two regular hybrids and two plug-in converted Ford Escape Hybrid and Toyota Prius. The results of the seven-week driving experiment for the converted Prius plug-in showed an average fuel economy of 93.5 miles per US gallon (2.52 L/100 km; 112.3 mpg) across all trips, and 115.1 miles per US gallon (2.044 L/100 km; 138.2 mpg) for city trips, the maximum reached for any of the driving conditions tested. A summary of the results of the seven-week driving experiment are the following
| RechargeIT Driving Experiment results Average miles per gallon |
|||||||
| Internal combustion engine | Hybrid electric | Converted Plug-in hybrid | |||||
| Type of trip | Ford Expedition | Toyota Sienna | Toyota Corolla | Ford Escape Hybrid | Toyota Prius | Ford Escape Hybrid plug-in |
Toyota Prius plug-in |
| Average for all trips | 14.2 | 20.3 | 30.8 | 32.2 | 48.4 | 49.1 | 93.5 |
| Average for city trips | 11.8 | 17.8 | 26.6 | 31.2 | 47.3 | 45.9 | 115.1 |
| Average for combine city/highway | 14.9 | 20.4 | 31.4 | 31.6 | 46.4 | 52.0 | 101.9 |
| Average for highway trips | 18.6 | 25.2 | 39.0 | 34.4 | 53.1 | 51.1 | 68.7 |
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They record simply
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“That which we call sin in others, is experiment for us.”
—Ralph Waldo Emerson (1803–1882)