haha, tis a shame as i was quite confident it would make a little difference but computer says no! After a good 5 hour blast the other day my engine feels much smoother and quieter on tickover and even further up the revs so i would definitely reccomend that. Unfortunately after doing both tests i reset the fuel trims so not had chance to see if the mpg has gone up or not yet but will keep a close eye on it and report back over the next few days