Fuel Economy Facts and Myths - GM Techlink
Although it is impossible to predict the effects of adding various chemical additives to gasoline in an attempt to increase fuel economy, often the results can be damaging.
Figures 2, 3 and 4 show 6.2L V8 engine components that were run for less than 3000 miles on gasoline that had a small amount (less than 1%) biodiesel added to it.
