Sorry for the extra post but I found this interesting and thought I'd share in relation to BP and Sunoco not being on the "TOP TIER" list.
Pick Your Poison: An Updated Environmentalist's Guide to Gasoline - January/February 2007 - Sierra Magazine - Sierra Club
Quote:
In the United States, drivers consume nearly 400 million gallons of gasoline per day. Many of them are committed environmentalists who are well aware of the true cost of fossil fuel. They drive fuel-efficient cars and carpool but wonder if they could also send a message through where they choose to buy their gas. Sierra reviewed the records of the eight largest U.S. oil companies, and here's what we found:
Bottom of the Barrel
* ExxonMobil
* ConocoPhillips
Middle of the Barrel
* Royal Dutch Shell
* Chevron
* Valero Energy Corporation
* Citgo
Top of the Barrel
* BP
* Sunoco
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I'm not going to list everything on that webpage but check it out its pretty interesting, not to mention a funny coincidence in regards to BP and Sunoco not being on the Tier List.