I repalced 4 out of 6 spark plugs last weekend and noticed the old ones had a large gap, approximately double that of the new plugs.
The new ones are Bosch platinum
Will a larger gap increase performance and fuel economy?
I appears that the mileage is a little bit less than before.
yeah, I know, there are 2 more plugs hidden somewhere that need to changed as well :shakehead

.048-.053 is the recommended gap (some come in the package gapped at .035). I hope you are happy with the BOSCH Plugs, most of us use the OEM Champion Double Platinum good for 100,000 miles.

Plus Bosch plugs are junk,they do not last and the Champions do last.I see Bosch plugs and there is one place they go: in the garbage can!

It's normal for the gap to increase as the plug wears. No, a wider gap will decrease mileage and perfromance. A wider gap equals greater resistance to the current that has to cross that gap to produce a spark.

thanks for the replies, I guess I'll switch to Champions then.
I thought I read once in a Hot Rod magazine long time ago, that a larger gap combined with a powerful coil (MSD) would produce a better combustion, therefore better mileage and performance.
Of course that was meant for carburated V8 engines with distributors :lol:
cheers