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I put these in my 13' f-150 5.0. Instantly they were smoother running than the original plugs. There is a noticeable power increase at higher rpm. Everything else is just smoother. I have not notice any difference in fuel economy which is what I was really seeking. I have used E3 plugs in many autos and small engines before and have always been pleased.
Verified purchase: Yes | Condition: New
With this product I feel there is more of a low mid to high rpm range improvement. I have been running these plugs for a short time, but what Im experiencing is well worth it, as for longevity the manufacturer is saying a 100,000 miles, we'll see only time will tell.
Verified purchase: Yes | Condition: New
These plugs are fantastic. I run them in a 1984 Pontiac Firebird with a 5.0 carbureted , a 1989 Honda Shadow 1100 cc V-Twin carbureted, a 2011 Harley-Davidson Ulta Glide 103 ci fuel injected, a 2015 Chevy Equinox 2.4 liter fuel injection as well as a couple of small engine equipment. The E3’s have been my go to spark plugs for years. Easy starting, smooth idle, good power. I don’t track fuel mileage so I can’t say if there’s a fuel savings. I purchase the E3’s for reliability and smooth operations. I recommend them to friends.
Verified purchase: Yes | Condition: New
I’ve used this brand on my ford F53 motor home and got better performance and they added 1-1/2 mpg increase which doesn’t sound like much but to those of us who drive gas powered coaches its a considerable boost. So I finally put them in my tow-vehicle, a 2007 HHR. so far so good.
Verified purchase: Yes | Condition: New
Makes my truck run great and has more power and performs better. These plugs are the best that i have tried and fit good to specification no gap to set is a plus, should have tried them sooner.
Verified purchase: Yes | Condition: New
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