Since we're on the subject of fuel, when we bought our Durango ('05) the dealer told us not to use any gas that had TECHRON additive in a MOPAR engine. He said it "eats" the seals. I thought he might be feeding me a line of BS, but mechanic backed that statement up, so I don't use Chevron or Texaco unless there is nothing else around.
My Durango and Cherokee (RIP) both run best on CONOCO PHILLIPS gas, and as luck would have it, it's usually $.05 cheaper per gallon than the Chevron brands.
Man was indeed meant to fly...but only in one direction!