Gas grades refer to the different types of gasoline available at gas stations, commonly labeled as regular, mid-grade, and ...

Pros: Potential for excellent fuel economy, run on existing gasoline supplies, and drive just like regular cars, requiring no change in lifestyle habits. Cons: Some hybrids cost much more than ...

All fuel cells have the same basic configuration, an electrolyte and two electrodes, but there are different types of fuel cells, based mainly on what kind of electrolyte they use. Many ...