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The 2014 Ford Fusion requires regular unleaded gasoline with an octane rating of 87 or above. Avoid using diesel or E85 in your Fusion as they could harm the engine and fuel system. I suggest opting for the highest octane fuel you can afford, as a higher octane number leads to more complete burning in the engine, reducing carbon buildup on valves and pistons. Some fuels labeled as top tier contain detergents that can clean existing sludge from your engine, improving its performance and longevity.
The Ford Fusion is best suited for 89 octane gasoline.
The manual states that it's important to select the correct fuel for your gasoline vehicle, which should be UNLEADED gasoline or UNLEADED gasoline blended with up to 15% ethanol. Flex Fuel Vehicles (FFVs) are marked with a yellow bezel on the fuel fill inlet, and should not use fuels with more than 15% ethanol, E-85 fuel, methanol, metallic-based additives, or an octane booster additive called MMT. Leaded fuel is also illegal to use. Using any other fuel can harm your vehicle's powertrain, affect the emission control system, or reduce performance, and any resulting damage won't be covered by the warranty. The recommended octane rating is regular unleaded gasoline with an (R+M)/2 octane rating of 87, but it's best to avoid fuels with ratings lower than 87. Premium fuel is suggested for demanding tasks like towing a trailer as it can enhance performance.