
675Transportation
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gasoline savings as a percentage of the gasoline usage by an all-gasoline eet in the same
year would only be about 30% for the HEVs and 38% for the PHEVs. These relatively small
reductions in the gasoline use are due to the fact that despite the introduction of more ef-
cient vehicles, it takes time to replace the existing eet of cars, and the positive effects will
not be realized for some years.
12.7 Advanced Ground Transportation with Biomass Fuel
In the previous section, we have analyzed the potential of using batteries combined with
traditional engines to reduce the petroleum consumption ...