Quote Originally Posted by Chopper View Post
Since our thrashy ol Isuzu 6 runns out of breath long before redline, it really only helps to about 4500 rpm....the last couple thousand rpm is all clatter, and agricultural noise.
That's true for the stock VX, but a supercharged VX has much longer legs, with almost all of the improvement above 4000 rpms. Plenty of reason to run in Power Mode if you have an S/C!

That said, I haven't noticed much of a difference between how it performs on premium vs. regular. I'll try switching back and forth a couple of times this winter...