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Higher octane DOES NOT mean better fuel. The different octane fuels sold today are made for different engines not better performance or cleaner burning. Gas companies sell gas with names like "Premium" to get you to buy the high priced gas. After all the gas that costs more must be better right....NO!
Different octane fuels are sold for engines with different compression and timing. My dads 2000 Jag must have the premium gas because of the high compression of the engine. 91 octane fuel is more resistant to burning from engine heat and compression then 87. The reason for this is because you don't want a high compression engine igniting the 87 fuel due to compression before the piston has reached the top. If the explosion happens before the piston reaches the top it’s forcing the piston back down while all the other pistons are forcing it up via the crankshaft. Needless to say this causes loss in power, MPG, and can even damage your engine if not corrected. Using high octane gas in a low compression engine (like ours) also cause loss of power, MPG and can cause you to fail a smog test. See, the high octane burns slower so it takes longer for all the fuel to burn. You want that fuel to burn FAST before the exhaust valve lets out the trapped gasses. You don't want unburned fuel leaving your engine. That’s what clogs O2 sensors and CAT's.
If you really want to use high octane fuel you need to change your timing. If you are getting a knocking sound and the way you fix it is higher octane then you might want to look into why your engine is knocking in the first place when using the right fuel.
Don't be a marketing target for the gas companies. They are all laughing at the world because people don't know any better.
Higher octane DOES NOT mean better fuel. The different octane fuels sold today are made for different engines not better performance or cleaner burning. Gas companies sell gas with names like "Premium" to get you to buy the high priced gas. After all the gas that costs more must be better right....NO!
Different octane fuels are sold for engines with different compression and timing. My dads 2000 Jag must have the premium gas because of the high compression of the engine. 91 octane fuel is more resistant to burning from engine heat and compression then 87. The reason for this is because you don't want a high compression engine igniting the 87 fuel due to compression before the piston has reached the top. If the explosion happens before the piston reaches the top it’s forcing the piston back down while all the other pistons are forcing it up via the crankshaft. Needless to say this causes loss in power, MPG, and can even damage your engine if not corrected. Using high octane gas in a low compression engine (like ours) also cause loss of power, MPG and can cause you to fail a smog test. See, the high octane burns slower so it takes longer for all the fuel to burn. You want that fuel to burn FAST before the exhaust valve lets out the trapped gasses. You don't want unburned fuel leaving your engine. That’s what clogs O2 sensors and CAT's.
If you really want to use high octane fuel you need to change your timing. If you are getting a knocking sound and the way you fix it is higher octane then you might want to look into why your engine is knocking in the first place when using the right fuel.
Don't be a marketing target for the gas companies. They are all laughing at the world because people don't know any better.
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