I dont care if I "notice" a difference. If I get a more efficient burn, then everything benefits, even if it is only a little bit. And those sparkplugs with the 4 grounds, actually make certain cars run worse so more isnt always better.
This is the whole point you guys arent understanding.
You are using more of the fuel that gets sprayed into the motor, so you get up to speed quicker because you arent wasting as much.
If you get 1mile more for every gallon you use, it will add up. Lets say you average 27 mpg, and fill up 10 gallons every week.
27*10= 270 miles per fill.
270*52 = 540+13,500= 14,040 miles per year
28*10 = 280 miles per fill
280*52 = 560+14000=14560 miles per year
So you are able to drive an added 520 miles in that given year, which equates to roughly 2 fills. So if youre filling up @$3.00 per gallon, you just pocketed $60.00 by doing next to nothing.
It doesnt look like much, but with all of the penny-pinchers trying to save a buck, (look at all of the "how cheap can I turbo my car") every little bit helps.