Quote:
Originally Posted by dangonay
There's no reason that lower octane fuel would reduce your mileage. Under normal driving conditions your engine will only be producing a fraction of its maximum output, so you're not going to run into conditions that require higher octane (like knock from advanced timing or heavy load).
Your engine would definitely produce less power at full throttle (or heavy throttle) but should still perform similarly under light throttle.
I doubt anyone could even accurately measure the difference in mileage between going up or down in octane from the recommended fuel your vehicle takes.
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How do you know? Are you a car engineer?
I'm sure pretty much everywhere you look on google, they would teel you using lower octane gas will affect your gas mileage.
I'm not an engineer so I have no clue how realiable google articles are, just fyi.
Also it doesn't really matter if he's driving under "normal conditions"...what did you mean by this?
If engine has high enough compression or boost to detonate...I'd say high octane gas is necessary.
I know ECU will adjust ignition timing and stuff...but I don't think ECU can control air getting compressed and air friction igniting fuel in the combustion chamber.
Then again, I am a complete noob so...