I could instantly notice the difference in acceleration and improved gas mileage on the freeway since I travel constantly

Better mileage.

Complete junkI wish I never ordered theseStarted to get horrible gas mileage and then started missing firing .will post pictures of the spark plugs

I drive 50 miles one way to work each day, so far it looks like there is better gas mileage, I will drive it for a couple of tanks of gas to make that determination.

Noticed increased horse power no rough idle and better gas mileage.

I can tell stronger smoother power and better gas mileage

Put these in a Honda Ridgeline (which are notorius for bad fuel mileage

improved gas mileage

I had run on these plugs now for about 5,000 miles and they give my car very smooth acceration and good gas mileage

A little more power and a little better gas mileage

Amazing gas mileage

I thought I'd test these plugs in my car like a lab rat for others I will say they gave me 0 issues but at the same time I haven't gained mileage or power at all so most likely I'll be going back to iridiums installed at 110k mls still going with e3's

They will improve performance and gas mileage.

Cant wait to see if I get better gas mileage

Well after 40,000 Miles, one of the plugs fouled out, (not sure which one or if it was more than one plug that failed), the car just started to sputter as I hit the gas on the Interstate the other day

Had to return the product and get NGK g-powers which worked awesomely in my car