· The average fuel economy of 7 Accord Hybrid drivers was 31.81mpg, or 0.6 percent less than EPA's combined estimates.
· The average fuel economy of 5 Escape Hybrid (4wd) drivers was 28.57 mpg, or 7.8% less than EPA's combined average.
· The average fuel economy of 5 Lexus RX400h drivers was 25.15, or 13.3 percent less than EPA combined average.
They also concluded that:
· Using the AC or heat could decrease the ratio of actual to expected fuel economy by nearly 3.5 percent.
· Driving on hilly terrain could increase the ratio by 3.2 percent or more.
· Adding 10,000 miles to the odometer could increase the ratio by 3.0 percent, suggesting a learning curve for hybrid drivers.
The Web site states, “…the large and unavoidable variability in driving behaviors and driving conditions presents a huge challenge in determining actual fuel economy figures.”
The Web site plans to offer mileage tracking soon, which will allow users to create a hybrid blog, upload photos, track mileage and interact with other hybrid drivers.