Effuel is a performance chip that, according to the official website, is designed to save you fuel without modifying your car. The way this device works is you plug Effuel into your car, and it changes your car’s performance without requiring you to change your driving habits. After installing Effuel, you may be able to lower fuel consumption by as much as 35%. https://www.influencive.com/effuel-real-benefits-or-fake-results-effuel-consumer-reports/