8th Generation Honda Civic Forum - View Single Post

milestoneiii · 09-26-2008, 10:10 PM

I use Shell V-power 93. I get 33 MPG in my Si sedan. Won't go anywhere else if I can help it. As for the "regular" burning more efficiently than the premium...maybe a fluke or the new engine breaking in. Higher octane mixes oxygen and fuel better, burning quicker with less heat, making it more efficient. It simply transfers more explosion to motion rather than heat. Mathematically 87 can not be more efficient than 93. The only difference may be the computer controlled Air to fuel ratio burning the "regular" really lean, using less fuel per cycle saving gas - hence the fluke/break-in comment.

No, running 93 occasionally and using 87 mostly is not a good idea. Why risk detonation? Might as well super glue the accelerator to the floor and use the ignition switch to stop yourself. It will be the same wear on the engine as slamming the rev-limiter. Detonation is detonation. Engine runs too hot in the combustion chamber and forces something the wrong way. Simple as that. DO THE MATH.

09-26-2008, 10:10 PM	#99 (permalink)
milestoneiii Senior Member Join Date: Mar 2008 Location: Clemmons, NC Age: 26 Posts: 479 Kory	I use Shell V-power 93. I get 33 MPG in my Si sedan. Won't go anywhere else if I can help it. As for the "regular" burning more efficiently than the premium...maybe a fluke or the new engine breaking in. Higher octane mixes oxygen and fuel better, burning quicker with less heat, making it more efficient. It simply transfers more explosion to motion rather than heat. Mathematically 87 can not be more efficient than 93. The only difference may be the computer controlled Air to fuel ratio burning the "regular" really lean, using less fuel per cycle saving gas - hence the fluke/break-in comment. No, running 93 occasionally and using 87 mostly is not a good idea. Why risk detonation? Might as well super glue the accelerator to the floor and use the ignition switch to stop yourself. It will be the same wear on the engine as slamming the rev-limiter. Detonation is detonation. Engine runs too hot in the combustion chamber and forces something the wrong way. Simple as that. DO THE MATH. Last edited by milestoneiii; 09-26-2008 at 10:12 PM.