yesterday i put a bottle of gum-out fuel injector cleaner in the tank before filling up with super, ( i always use super ) and topped off the oil with a quart of 20/50 weight oil. is it my imagination or did i immediately notice a big difference ?? i noticed something right away, but i'm not sure if the gum-out could have even made a difference after 20-30 miles. also, about 2 months ago i did a major tune and maintenance on the car and just now it seems like everything is seated and running smoother than right after i did the major tune + maintenance is that possible ?? thanks for the feed-back.