Hey RimFire,rimfire said:Joshua,
I too have seen Royal Purple at Pep Boys also and never bothered to try it. It is very expensive. I've always used Mobil 1 myself as it's expensive enough for my pocket book. I have wondered how they compare though. Anyone who wants to give us the scoop.
For your cross country trip I usuall keep 35 in the front and 41 in the back according to the instructions on the door. Doing this it's give me 21.2 on the highway but it's not easy to do but it can be done.
Now and then I still think about trying an engine treatment in order to increase MPG in my "D". I've heard all the pros and cons of doing this but now a days can one stand to lose anything at this point?
Just a little correction. We're only driving up to the Bay Area. I'm not much of a long distance driver so you'll never see me driving cross country. Maybe when I retire some day. But that won't be for a long time!
You mentioned the tire pressure for the front and rear to be 35 and 41 psi, respectively. Does this only apply to the factory tires? My stock tires were 255/65/16 but I've since been running R/T rims with 275/60/17 Falkens.
As far as Royal Purple oil, too expensive. I'm gonna use another less expensive synthetic oil next time.
Thanks for the advice!