E85 Mix Ethanol Calculator

E85 Mix Ethanol Calculator is a precise fueling utility for drivers, tuners, and motorsports enthusiasts to plan accurate ethanol blends for flex-fuel and E85 setups. Quickly determine how much E85 and regular gasoline to add to reach a target ethanol percentage, reduce guesswork at the pump, and protect your engine during street or track use. Core features: - Target blend calculation: Enter tank size, current fuel, and desired ethanol percentage to get exact E85 and gasoline amounts. - Real-world accuracy: Account for actual pump ethanol content (E70–E85, E10, etc.) and choose gallons or liters for easy use anywhere. - Fast workflows: Save favorite targets and sources for quick repeat fills, with optional cost and octane impact estimates to inform fueling decisions.