Nissan 370Z Forum - View Single Post

WoZZer · 08-02-2009, 10:06 PM

Octane and economy are not exactly related, but could be. Heat value of the fuel will give you the economy, and the higher octane will give your engine the ability to make more power (more spark advance). In general, higher octane fuel also has more heat value, so should give you more economy. If you don't find the 94 octane is giving you any more power or economy, you are paying extra for nothing. People often confuse octane and power as being synonymous but may not depending on the engine. Octane rating is the ability of the fuel to resist pre-ignition, nothing more. Diesel, as an example, is a high octane fuel but obviously not proper for a "gasoline" engine due to many other properties. If your engine does not require high octane (higher compression), then don't waste your money. I've been using Shell 91, and all is working fine.

08-02-2009, 10:06 PM	#2 (permalink)
WoZZer Base Member Join Date: Apr 2009 Location: NE of Somewhere Posts: 61 Drives: 370Z - gone Rep Power: 16	Octane and economy are not exactly related, but could be. Heat value of the fuel will give you the economy, and the higher octane will give your engine the ability to make more power (more spark advance). In general, higher octane fuel also has more heat value, so should give you more economy. If you don't find the 94 octane is giving you any more power or economy, you are paying extra for nothing. People often confuse octane and power as being synonymous but may not depending on the engine. Octane rating is the ability of the fuel to resist pre-ignition, nothing more. Diesel, as an example, is a high octane fuel but obviously not proper for a "gasoline" engine due to many other properties. If your engine does not require high octane (higher compression), then don't waste your money. I've been using Shell 91, and all is working fine. Last edited by WoZZer; 08-03-2009 at 03:31 PM.