Conclusions For the time being, the public s alternatives are extremely limited. CNG and LPG both offer lower emissions, but fuel availability is extremely limited. This problem can be solved by bi-fuel vehicles, with an accompanying loss of vehicle efficiency. Ethanol and methanol should not be considered. True electric vehicles are practical as commuter vehicles but both the range and price of these vehicles limits widespread use.
Hybrid electrics hold the most promise for the future.
The first generation of parallel electrics will be released in 1998. The more efficient series electrics will not be unveiled until the next century at the earliest. The Big Three U.S. automakers all hope to have a series electric on the market in 2004. This vehicle promises all the features of today s sedans with three times the gas mileage. Modify their habits.