well blind driver, i have a limited supply of WMO, i drive a lot of miles, and i depend on my van for my business. i'd rather be a little too conservative and still save a little money than push my luck.
i've done a lot of reading around here, and it seems the general consensus is that running too strong of a mix is much more prone to causing problems than running a conservative mix. so for me and my needs, i'm staying conservative