I recently had to replace my PVC tank/lines because of carbon build up. At the same time I installed new Pulstar be1i Iridium Pulse Spark Plugs. Afterwards I drove my car for two weeks without filling the gas tank. I thought the fuel gauge was broken and I would run out of fuel. Needless to say there was no problem with the gauge, just a great increase in MPG. I am going to manually calculate the MPG to see what I am truly getting now and will post the results later.

 

same with me
normally ide fill up every week (every 7 days) now i go every 10-11 days
same driving habits just new sparks

of course however, someone NEVER changed the 5th spark plug! it seems they dident realize the car is an inline 5