Some hybrid electric vehicles (HEVs) combine a conventional internal combustion engine (using gasoline,
diesel, natural gas, ethanol, or other fuel) with the battery and electric propulsion motor of an electric
vehicle. Other hybrids combine a fuel cell with batteries to power electric propulsion motors. Look to
"What is Hybrid Electric Vehicle?" for more information describing HEVs.
Three types of testing has been done on HEVs to date, HEVAmerica Baseline Performance Testing,
Accelerated Reliability and Fleet Testing, and Pomona Loop Open Road Testing. The test results are listed below:
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