10-4
Seems a propane or CNG or even w/m system could really prove beneficial for you, no? Ol dude w/ van & lbz truck (I'm totally drawing a blank on his name though -_- ) has increased his mileage substantially w/ his w/m kit. The w/m may be easiest to accommodate otr trucking though so you aren't running out of CNG or propane out in BFE and not able to fill up. I believe his oil analysese should that distilled water & boost juice methanol yielded the cleanest results but in a bind, you could use washer fluid or straight water or something.
CNG or propane may extend your diesel fuel mileage further than the w/m (Jeff/stingpuller logged 40-some odd diesel MPG w/ CNG setup during the Diesel Power Challenge IIRC) but availability may be an issue & I have to assume CNG and propane either one would cost more per gal (or lb or whatever unit it's sold as) than a w/m solution?
Just something for you to chew on a lil bit.