It possible to run either bio-diesel --- which you can make with used cooking oil and currently is widely available for free from your local restaurants. Racing methanol is about $2.50 per gallon, but you only need 1/5th of a gallon for every gallon of biodiesel. Lye is about $5/lb. at the hardware store, but closer to $3/lb. in 25lb. bulk bags. You need about 1.5lbs/40 gal.
Or run veg oil. Fire the truck up on diesel, switch over to grease - a few miles to destinination switch back to diesel. Don't forget to switch back or you will have trouble starting her backup.
I know of a couple people doing it.
That's exactly what i've read. I just want to hear or see if anyone actually knows someone doing this rather than some euro turd on the net.