Original sentence: Anhydrous (less than 0.5% water) ethanol can be blended with gasoline in varying quantities to reduce the consumption of petroleum fuels, as well as to reduce air pollution.Ethanol can be used as fuel for vehicles with spark ignition (not diesel) engines either alone (E100) or as an additive to gasoline.However, a tropical climate is required to grow sugarcane.Hydrated ethanol (azeotrope with 4% water) is also used as fuel in some countries.Special fuel system design is required to accommodate fuel with more than 10% ethanol, and in addition, for reliable starting at low ambient temperature, a special engine starting system is required to accommodate more than 30% ethanol.Two common mixtures in the United States are E10 and E85 which contain 10% and 85% ethanol, respectively, while the common mixtures in Brazil are gasoline type C and its high octane variants, which contain 20% to 25% ethanol
Edited sentence: Ethanol can be blended with gasoline in varying quantities to reduce the consumption of petroleum fuels, as well as to reduce air pollution.Ethanol can be used as fuel for automobiles either alone (E100) in a special engine or as an additive to gasoline for petroleum engines.Two common mixtures in the United States are E10 and E85 which contain 10% and 85% ethanol, respectively, while the common mixtures in Brazil are gasoline type C and its high octane variants, which contain 20% to 25% ethanol (also the only kind of gasoline legally sold in fuel stations)