The new spark plugs (and spark plug wires purchased separately) work great, and the factory gap of 0.44 inches held up during shipping (however, you always, always, always have to gap check your spark plugs! Do not neglect this!). My 12 year-old Honda Accord (150k miles) runs almost like it did when I first bought it, and I've increased my tank mileage by about 10-20 miles. It's not a huge difference, but that adds up over time. I'll installed these in a year or earlier if anything goes wrong, but they've been installed for a month, and so far, everything is ok.
Posted by Bob (Hilltop, MN) / April 13, 20141983 Toyota Corolla