Well i am just kind of going through the car and replacing stuff that it going to help with Fuel economy. So far i am seeing improvements in Avg fuel consumption, but ideally i want to test on a FULL tank of 98 ron. This is 3/4 tank 95 RON. I also want to change the Plugs (BFPR7E-13?) 1 step colder? Is this ok for Stock boost?