Curious how you guys feel on this. Any of the newer cars (2000+ ?) that "recommend" premium will usually run fine on regular, they just pull timing back a bit and you lose a little bit of power at the top end. With that being said, do you always run premium (91+) in your cars that recommend it, or if you're just putting around town will you run regular every now and then?
I always run it in my 325, but in the wife's SQ5 she decided to start filling up with 87 instead of premium. After driving it a few times, you can't tell any loss of power until you're deep in boost, even then it's more than enough power. Considering she only drives 4-10 miles per day, I see no problem with this.
I'm also curious to see if this becomes more common if gas prices start to rise. Will more and more people decide premium isn't worth an extra $0.50-0.75 per gallon?