Quote:
Originally Posted by Couper93
Not sure what the other posters are trying to say so if I repeat, my bad...
Octane is the temperature at which fuel will ignite. Higher the octane, higher the temp to ignite, hence more compression, hence more power. Our engines run a higher compression so in order to optimize performance you need a high octane fuel. Yes modern engines have knock sensors so when you do have bad gas or lower octane, you won't damage the engine but with that , lower octane can result in less timing to compensate for less compression which will lead to less performance.
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Complete agree, well said. My original response was more around cost savings and MPG. So far I have noticed a performance difference with 89 octane. The X5 is plenty fast, so it's not a big deal for me. I'm still working on measuring gas mileage to see if it is worth it. As someone else said, if MPG drops 5% then it's a push and I should just run premium