fuel grade?
Apathy Kills
Joined: Nov 2002
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From: The Left Lane
Premium Unleaded. 91 octane minimum, 93 is prefferable.
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www.ufc.com
Joined: Sep 2004
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From: Irvine CA
Factory requires Premium. I don't know about anyone else, but I tried to go cheap once and my engine knocked like it wasn't supposed to. Went back to Premium and it went away. Never tried that again.
Hybrid Forum Moderator
Joined: Mar 2000
Posts: 2,363
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From: Southwestern PA
Higher octane fuel isn't a "better" or more powerful blend of gas, but rathrer one that's more resistant to knock, or detonation. If a motor is built for and runs fine on 87, there's not benefit to running anything higher in it. However, if your motor has higher compression, lots of timing or forced induction, the extra knock resistance of higher octane fuels becomes nessicary. All DOHC VTEC engine's require 91 or greater and have a knock sensor that will listen for detonation and pull back the timing to protect the engine but it won't make as much power. Long story short, yes, you need premium fuel.
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Andy - Reinstated Hybrid Forum Moderator
'06 Subaru Legacy Spec B - Stock, for now
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Andy - Reinstated Hybrid Forum Moderator
'06 Subaru Legacy Spec B - Stock, for now
'98 Civic EX - CTR headlights and grill, Kosei K1's, for sale
'90 240SX - SR20DET that will never get installed, project car.
Senior Member
Joined: Dec 2004
Posts: 672
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Originally Posted by Andy
Higher octane fuel isn't a "better" or more powerful blend of gas, but rathrer one that's more resistant to knock, or detonation. If a motor is built for and runs fine on 87, there's not benefit to running anything higher in it. However, if your motor has higher compression, lots of timing or forced induction, the extra knock resistance of higher octane fuels becomes nessicary. All DOHC VTEC engine's require 91 or greater and have a knock sensor that will listen for detonation and pull back the timing to protect the engine but it won't make as much power. Long story short, yes, you need premium fuel.
You always want to run the lowest octane that you can get away with. Running higher octane will not increase power and may ultimatly effect fuel economy and it will effect your wallet in a negative way.