[2001 ZTS]

I took a two week course (hands on/immersion (literally and figuratively)) that dealt with cleaning bulk storage tanks on oil tanker ships. The amount of residue left after a hold full of regular was astounding, it gets resold as "bottom ends" (aka tar & roofing flux). One of my ships will load 70,000 barrels of that crap today from the Irving Oil petrol refinery. They heat it too 350^F just to make it flow. A tank of premium was spotless and is under valued at the pumps.

My Focus had a dozen chronic fuel related problems since the start as everyone knows. I've had zero since going with 89 over 87. Again, it is not the octane but the quality control applied against the higher grades.