Between the early 1920s and 1980s, much of the gasoline used in the U.S. was leaded. Though usage peaked in the 1970s, it wasn’t banned as a passenger car fuel additive in the U.S. until 1996, and ...

Lead was phased out of gasoline sold for cars and trucks decades ago. But that brain-damaging fuel additive used to prevent engine knock is still being spewed into the air across the nation — ...

Let's face it, most engine additives don't really improve performances. If you want to try one that does, here's what you should pick.

Engine knock, wherein fuel ignites unevenly along the cylinder wall resulting in damaging percussive shockwaves, is an issue that automakers have struggled to mitigate since the days of the Model T.