premium, i put it in everything,lawn mower, weedeater,4 wheeler and motorcycles. just do and always have. waste or not. makes me feel warm and fuzzy all over.?
Has anyone tried the 87 octane but ethanol free? Here 87 with ethanol is 1.66$ per gallon vs ethanol free 87 at 2.12$ per gallon. Supposedly better mileage with ethanol free, less corrosion issues.
I have 90 octane ethanol free here, and have run it on my last 2 tanks. MPG jumped and I can get 14.5-15 pretty easy on the hwy if not better.Has anyone tried the 87 octane but ethanol free? Here 87 with ethanol is 1.66$ per gallon vs ethanol free 87 at 2.12$ per gallon. Supposedly better mileage with ethanol free, less corrosion issues.
Octane is an index number assigned to the resistance of fuel to "pre-ignite" meaning it lights before the ignition system starts it.
Pre-ignition or detonation occurs when the flame front collides with itself and is typically caused by hot spots (IE carbon deposits) within the cylinder or combustion chamber that starts the combustion process by more than the intended ignition source.
Everything built within the last 3 decades (vehicles with gas engines of course) are equipped with detonation sensors, which is a piezo-electric sensor that generates a signal based on a "specific tuned frequency". When the PCM receives this signal which is pre-ignition or detonation, the timing is retarded to eliminate it.
Now, with all of this basic background stated in simple and generic terms, let's look at the effect of octane.
Higher octane (higher index number) gasoline has a higher resistance to pre-ignition or detonation. It is less flammable than lower octane fuel and thereby produces less BTU per pound. Using higher octane gasoline in vehicles that do not require it can lead to building carbon deposits in the cylinder and combustion chamber at a higher rate than what would happen with a lower octane gas.
In other words, if FMC says 87 octane is fine, then use 87 octane.
87 octane ethanol VS 87 octane pure gas.
Ethanol by nature has a much higher octane rating than gasoline, in fact the BTU per pound is roughly half of gasoline. Which explains why a race car on alcohol takes nearly 2 x the amount for the same horsepower.
All alcohol is hygroscopic (meaning it attracts moisture) and can become very corrosive by nature.
Alcohol at proper levels mixed with gasoline is approved by vehicle manufacturers, E-85 can only be used in vehicles specifically equipped to use it.
In the end, pure gas is the best thing to use if it is available in your area and within your budget. Most places around here (NC) get upwards of an additional $1 per gallon, which makes it not cost effective for vehicle use. However, I always used it in my boats and continue to use it in all of my small engines.