Ethanol fuel, often lauded for its environmental benefits, has become a common additive in gasoline. However, its impact on older engines and systems is a topic of concern for many vehicle owners.

Dear Car Fix: My engine has some issues and the dealer told me I had bought bad gas. What is the real story? My friends told me it really was the ethanol in the gas. Can you explain it all? Thanks. -- ...

Folks have been experimenting with ethanol in modern combustion engines even when they weren't so modern. Nicolaus Otto, the inventor of the traditional four-cycle engine, used it to power one of his ...