Sorry if this has been covered... searched.
Took a ~320 mi. trip. Before I left, I filled up with 89. There was about 1/8 tank of 91 in the tank when I filled up. At the end of the trip, the low fuel light was not yet lit, and there appeared to be about 1/10 tank left. Every other time I've made the trip (using 91-93 octane as I always do), the light has come on just as I'm arriving at my destination.
Nothing about this trip was out of the ordinary... same average speed, used the A/C most of the trip, etc.
So I'm wondering if the lower octane had anything to do with this, or whether it was just a fluke. The PCM is supposed to retard timing if lower octane is used, which would lower MPG instead of raise it. Of course, I'm not convinced the stock timing is really "optimized" for 91+ octane anyway, but that's a different story.
Anyone else encounter this?
