Take your savings (per fill up) and add in the fact that you are getting worse gas mileage, causing more frequent fillups and you will see that you aren't saving more than a $1.00 (if that) while causing damage to an engine.
("knock sensor will catch it" is a false statemnt, too, so don't go there.. the knock sensor operates BY DETECTING KNOCK... it has to HAVE HAPPENED, before it can do anything... once the sensor sees it, its too late...)
Ray
