Given the current prices of the gas, the process of circulating between shops and choosing a "better-value oil" is more expensive (in terms of spent gas price and personal time) than the oil itself. I'd buy the Mobil1 once I get to the shop and I'd forgot about the issue. The $9 per 5K miles cannot justofy even mere typing the post.

I personally buy Mobil1 6qt for $22 in our local Costco when I shop there.

Regards,
Oleg