Another Oil Thread

Hey guys, sorry about creating another thread about the choice of oil. But I could never really find a an answer for my question.

Most people on here are running oil that gives more of a performance edge, like full synthetics and whatnot. However, I'm trying to find the BRAND/WEIGHT of oil that gives me the best increase in fuel economy.

I switched to Mobil 1, and I actually saw a decrease according to the thing on the DIC. I was at 26.4 prior to the change, and am now at 25.1, and I don't think my driving style has changed. I have the 3.5L by the way, it's a G6 base.

So, any opinions on what oil will be the best for increasing economy?

Thanks a bunch.