I would like some help from knowledge-able people on a certain argument. A friend of mine tells me he installed 2 peformance chips (from MOPAR) on his Dodge Neon. When he did so, he was getting awful gas mileage, around 18mpg. He then told he took them out.
Long story made short, I know that he is BS'ing but I can't prove it. I don't think he ever installed the chips and believe that chips either improve your gas mileage or make it just worse (maybe 1mpg tops). If I could prove my claim, then his reasoning for taking them out will be trashed. Any help on if this is true or any links to something that can prove it are GREATLY appreciated.
Thanks as always,