I thought about upping the pressure but the ride is worse when the pressure is above 30 PSI! When I first drove to and from PNWX events I had the pressure at 36 PSI for the Swampers! The ride was like a buckboard!!! 90% of my highway driving is with the grabbers at 36 PSI. I am just wondering why the sudden drop all of a sudden in my MPG? I should have taken the swampers of after Thanksgiving weekend and put them back on for this coming weekend up in BC! I'll buy a timing light tomorrow and see if that is okay.