all i know is it was between a 2%-3.9% fuel consumption increase. but really it's more likely that it is a 2-3.9% increase in engine load so my car would show the most increase since its old and the engine is small. being a diagnostician i have a wide range of vehicles i come in contact with. i plan on continuing this study with newer vehicles that i can use a scan tool on instead of a lab scope and have more data to look at one time and i can take a snapshot of the entire data field and record it.