also use top tier gas, for example chevron. I have heard from numerous dealerships that most US gas have additivies that are actually bad fo the engine. for example arco.
Try and only use chevron or shell or other brand name gas.
i notice my car idles 200 rpm lower on higher octane.
We all get the urge...Saturday early morning...nothing to do till noon...
The aural sensations of 1st gear WOT
**CGM **(Certified Garage Mechanic)