You can mix it, you just have to make sure your ethanol content is the same, or the lambda will change much like it does from winter to summer blends. However, you would not want to do this without tuning. You would end up running lean.

Yes you can. Wide band 02 sensors, and a piggyback module for the PCM that can accept inputs from the new O2 sensors and properly control the injection system. Exactly the same. Used E85 without modification and, after a few months, the valves started failing.

E85 gas is suitable for use in any vehicle designated as a flex-fuel vehicle by the manufacturer. Cars.com reports that flex-fuel vehicles are capable of running on both ethanol-gasoline blends and regular gasoline.

You may use non-ethanol gas (87 octane regular fuel) in your E85 vehicle. You will experience better gas mileage than using E85 in your E85 vehicle. You may not use E85 in a non-flex fuel (E85) engine. Your engine will run horribly and you may damage seals in the fuel system.

E85 is typically cheaper per gallon than gasoline but slightly more expensive per mile. Performance. Drivers should notice no performance loss when using E85. In fact, some FFVs perform better—have more torque and horsepower—running on E85 than on regular gasoline.

E85 has an octane rating higher than that of regular gasoline’s typical rating of 87, or premium gasoline’s 91-93. This allows it to be used in higher-compression engines, which tend to produce more power per unit of displacement than their gasoline counterparts.

The fuel brings a dramatic improvement to the timing of a car without the use of methanol or race gas. With the right tuning, it is possible to make nearly 100w HP difference on E85.

E85 fuel can give you a significant boost in power and torque without breaking the bank for racing fuels. It has a base octane rating of 105 and has the bonus of added cooling properties that add even more knock resistance than racing fuels with the same rating.

The higher the fuel’s octane number, the more resistant it will be to knock. We also suggest you stick to the top brand of fuel (BP/Caltex/United/Mobil/Shell) and try and steer clear of any “no name” petrol stations. E85 Fuel. E85 can be perfect for the high horsepower or high compression build.

If the fuel flap tells you to use 98, that’s what you need to do. It can’t hurt your engine if you use a higher octane fuel. So, for example, if you use 95 or 98 in an engine designed for 91, that’s OK. However, it’s not acceptable to put in a lower octane fuel than the minimum recommended by the manufacturer.

Not quite environmentally friendly. While ethanol does burn cleaner than gas, meaning less smog, flex fuel cars still produce roughly the same amount of greenhouse gases as their fossil fuel counterparts. Not as efficient. A car running on E85 has about 80% the efficiency of the same car running on gasoline.

Many flex-fuel vehicles (FFVs) can use both E85 and unleaded gas without any problems, but if you accidentally fill your non-FFV with E85, you could be in for an issue. Your check engine light will probably turn on, but it will turn off once the fuel starts to burn off.