
Originally Posted by
biglang_liko
*renzo - same experience sir, I get about 5-10 percent better fuel mileage with blaze. But I read in another post na nag e10 narin daw ang blaze just recently, is this true???
*froshie - it depends on your engine sir if it's a high compression engine that requires higher octane gas, it will run at peak performance with less stress on it's components using the specified octane rating. It will probably still run on slightly lower octane gas, but the ecu will compensate by adjusting ignition timing when it detects knocking (pre-ignition caused by lower octane gas).
Knocking stresses out your internals cause the ignition cycle of cylinder that's knocking is out of sync with the other cylinders.
Another thing the ecu might do if it detects knocking is to enrichen the air-fuel mixture (the excess fuel being pumped into the cylinder is used to cool the AF mixture to prevent pre-ignition). This results in a lot of unburned fuel which becomes soot deposits fouling up your plugs and your oil and possibly damaging yout catalytic converter and increasing your fuel consumption.
On the other hand, if your engine is rated at a lower octane say 93, it wouldn't be able to take advantage of the knock-resistant properties of higher octane gas because it already doesn't knock at that low octane rating, and using more knock-resistant gas is pointless. HOWEVER, as sir Niky pointed out to me before, more expensive gas like Blaze has naturally more/better additives which give it better combustion and cleaning properties which should benefit your engine regardless of your engine's required octane rating.