Manufactured electric vehicles in 1999 include pickups and minivans. Ethanol is a liquid alcohol that can be made from corn, grains or agricultural waste . It is renewable and is stored in a liquid form making it very similar to gasoline in its operation. Benefits include its similarity to gasoline for transport, it is a renewable energy, and decreased emissions and greenhouse gas production. Mid-size sedans, compact pickups, and minivans are all available as ethanol vehicles in 1999.
Natural gas is a domestically abundant, odorless gas .
Natural gas has low levels of carbon and emits lower levels of Greenhouse gases and Ozone then gasoline. Many different types of natural gas vehicles are available in 1999. Propane is a gas but is stored as a liquid when pressurized to 125 psi. LPG is most commonly found as a byproduct of petroleum refining or natural gas processing. LPG vehicles operate cleanly and have good performance characteristics and range.