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The 2015 Subaru WRX underwent an impressive E85 ethanol conversion, embracing the unique properties of this 85% ethanol and 15% gasoline blend. Contrary to expectations, the switch exhibited only an 18.3% decrease in fuel economy, attributed to the engine's efficiency at lower RPMs. E85's benefits, including knock resistance and cooling effects, made a strong case for adoption, despite the limited bio-fuel infrastructure.In the realm of horsepower, E85 showcased its prowess, delivering a peak gain of 43.5 horsepower and 25 ft-lb of torque. The vehicle's quarter-mile time significantly improved, revealing newfound agility and acceleration. Challenges emerged with rigorous launches at the dragstrip, exposing weaknesses in the rear end, leading to differential failures. Despite setbacks, the WRX's performance in roll racing hinted at the untapped potential of this direct-injected, ethanol-powered beast.
