Well, that explains it! When I returned from Mexico, this dude in a Geo Tracker started riding my a$$ and I was so over it I dropped into 2nd at 40, floored it....and too my surprise he pulled on me! Had me by 4 car lengths to 80. At first I thought it was the AWD drive train loss, I shoulda known better than to go against any car from a roll, stock but now I KNOW that it was that crappy 78 octane Mexican gas.
Whew, I thought I was going to have to upgrade to a Cobalt SS after that but now I know it wasn't my Rex. I can sleep now.