the blessing of the cars car show los angeles

From : blessingofthecars

Q: just did a routine tune up and decided to give these new fangled bosch +4 platinum plugs a try. they have twice the spark and the gap is pre-set at the factory. they were pretty expensive 8 of them was $30 at walmart. but....now it seems to me my mpg has dropped quite a bit. i have not calculated it but it just seems this last tank of gas went awful quick. does anyone else have experience with these plugs good or bad i am thinking i may need to go back to champion plugs. mark .