ENGINE TREATMENT 'Greased Lightning '?

Question:
hi
i asked this before but could not add this as the question had stopped letting me post

Greased Lightning of improved mpg and reduced 'engine noise'
i notice that when i drive now my car is not as quite as it used to be when driving, its 3 years old and serviced each year, but lately when driving the engine can be heard compare to before it was so quite when driving
hence the question 'Greased Lightning reduced 'engine noise'
is it good

Do high performance spark plugs and air filters really imporve your gas mileage enough to advicate the price?

and thanks to everyone for answering my other question

Answers:

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