Originally Posted by respdoc
If a person is so cheap they are looking at saving a couple of quarters or so at fill-up, I would suggest at least doing it right and have the fuel setting changed at the dealer to the lowest possible (85 if I remember correctly). MB's have this option since they are exported all over the world, so I would think the crossfire should have the same adjustable setting.
Since I noted a tiny gain from switching to from 91 to 94 oct. that a local station just started offering...IMO, downgrading your gas is not worth it...Take a packed lunch to work an extra day as a trade off if your that much of a penny pincher. 
I don't know, if you read the article. It indicates that there is no sound economic or automotive reason for paying an extra 10-15% for premium...it's like giving an extra $400 per year to the OPEC cartel...forget the issue of cheapness, is there any good reason for paying extra for premium, besides that DC says so?