Neat article about what a scam these "plug in" gas savers are. I always wonder if if people realize that if it was this easy to save gas, why don't the manufacturers employs? Give them a heck of a marketing advantage!
https://www.msn.com/en-us/news/tech...&cvid=6a4cdd6b720547eda7415431e63014aa&ei=106
https://www.msn.com/en-us/news/tech...&cvid=6a4cdd6b720547eda7415431e63014aa&ei=106