Your spinning your wheels running premium---

Run regular gas , and dump a pint of marvel in the gas--it'll keep the
valve's from burning, and prevent seat recession--as well as lubricate
the guides, and rings------

Good for your engine in the long run----

The Marvel Guru---

BTW, what is the general consensus on fuel grade? Is there any benefit
to 91 octane or will 87 work?
I personally notice mild seat-of-pants non-scientific improvement in
uphill performance when running 93 Octane, but probably only because I
am running advanced timing on my '85 Westy. I don't think the WBX has
high enough compression to use the higher-grade fuel to its full
advantage, so I run regular most of the time and can still cruise at 80
on a flat road with some breathing room left.
Chris.
'85 Westy