testing with government fleets by the CTA at São José dos Campos, and further testing of several prototypes developed by the four local carmakers, including Volkswagen do Brasil, pure ethanol vehicles were launched in the Brazilian market. Petrol engines were modified to support hydrous ethanol characteristics and changes included compression ratio, amount of fuel injected, replacement of materials that would get corroded by the contact with ethanol, use of colder spark plugs suitable for dissipating heat due to higher flame temperatures, and an auxiliary cold-start system that injects petrol from a small tank in the engine compartment to help starting when cold. Within six years, around 75% of all Brazilian passenger cars were manufactured with ethanol engines. Production and sales of pure ethanol vehicles tumbled beginning in 1987 owing to several factors, including a sharp decline in petrol prices as a result of the 1980s oil glut, and high sugar prices in the world market, shifting sugarcane ethanol production from fuel to sugar. By mid-1989, a shortage of ethanol fuel supply in the local market left thousands of vehicles in line at petrol stations or out of fuel in their garages, forcing consumers to abandon ethanol vehicles. Flexible-fuel vehicles The 2003 VW Gol 1.6 Total Flex was the first full flexible-fuel vehicle launched in Brazil, capable of running on any blend of petrol and E100. In March of that year, on its fiftieth anniversary, Volkswagen do Brasil launched in the local market the Gol 1.6 Total Flex, the first Brazilian commercial flexible fuel vehicle capable of running on any mix of E20-E25 petrol and up to 100% hydrous ethanol fuel (E100). After the pure ethanol fiasco, consumer confidence in ethanol-powered vehicles was restored, allowing a rapid adoption of the flex technology. This was facilitated by the fuel distribution infrastructure already in place throughout Brazil, with more than 30 thousand fueling stations, a heritage of the Pró-Álcool program Owing to the success and rapid consumer acceptance of the flex-fuel versions, by 2005 VW had sold 293,523 flex-fuel cars and light-duty trucks, and only 53,074 petrol-only automobiles, jumping to 525,838 flex-fuel vehicles and only 13,572 petrol-only cars and 248 petrol-only light trucks in 2007, and reaching new car sales of 564,959 flex-fuel vehicles in 2008, representing 96% of all new cars and light-duty trucks sold in that year. VW do Brasil stopped manufacturing gasoline-only vehicles models for the local market in 2006,