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The first production ethanol (E100) fueled capable vehicle was launched in Brazil in 1979. In the decade of 1980, most of the vehicles in Brazilian market ran either on gasohol (E22) or on ethanol. By this time, two different engine hardware had been developed: one for gasohol and one for ethanol, the latter with a higher compression ratio assuring a better fuel conversion efficiency. In this period, it was usual to have same vehicle models operating with an E100 / E22 fuel economy ratio (FE in km/l) in the range of 0.75 to 0.80. This range is greater than the E100 / E22 energy content ratio which is approximately 0.70. The customers very well perceived the higher efficiency of the ethanol-fueled vehicle when the low E100 / E22 price ratio at the pump played a major factor for this perception.