Thanks to everyone for your help, especially Moncha for helping me with the forum.

I use 87 octane gas and I buy it from the same people for over 6 years.
I drive like an old lady, cause I had my license suspended for 1 year and I just got it back feb 14. 1 more ticket and they ''ll have it again . I start off very slowly at the lights and use cruise all the time on the highway set on 64.

With the STP I went 340 miles on 18.7 gallons which means my MPG was ~18 , for me that was a significant gain. I am not sure if STP gas treatment did the job or some other variables are at hand, but there you go.

Also, I have a delema. My air filter looks very new. I am wondering if I should put in a K&N or Calmani?? What will give me better fuel economy?

And to those of you who have an air intake mod, where do you get them, S or calmini and how did it impact you MPG ??

What kind of spark plugs are you guys using?? After changing the factory ones, did you see any change in MPG? Any one tried ultra-sonic plugs on their VX's ???

Thanks for your time guys