Back in 2004, several automakers got together to create a more pure form of gasoline to meet strict standards set by the U.S. Environmental Protection Agency (EPA), now known as Top Tier gasoline.

You’re walking down the aisle of your local auto-parts store and you happen to notice the shelf full of fuel-system cleaners.

Over time and miles, your car might start to slow down. It might not accelerate as quickly as it once did; the engine may not run as smoothly as you remember, or the fuel economy may dip—but ...

It's strange how things pan out sometimes. While I've been sporadically working on the gas tank over the past few weeks, which you're about to read about, it was never intended to appear in the same ...