I have to start off by stating that I'm not a fan of blending. I've seen some really bad problems caused by blending. But having a proper two tank system is the way to go. And filter/ dewatering your oil will make sure you will have many trouble free years of wvo'ing to come.
I really wouldn't try to blend in North Texas because your looking at some mighty cold weather up in that area. Do check out greasecar.com or
http://www.frybrid.com/. I have installed both and find them to be built with high quality parts.
Good luck and be safe.
__________________
Professional greasecar installer
Austin TX
98 Jetta TDI with grease car kit + veg-therm (totaled)
87 MB 300SDL running on B99 / greasecar kit + 30 fphe
www.austingreaseguys.com