Transfer Flow offers gas fuel tanks for Ford 7.3's....Decent short EXPO "detailed walk around" video but it skipped any discussion of range/fuel capacity. Using the "search" on this site I managed to find that the Grenadier has a 23-24 gallon gas tank (which would equate to 300-350mi loaded range on pavement?) and that the company may work with another mfr like LRA to offer an aux tank. IMO one of the top three reasons gas engine is undesirable for motorized camping is limited range and the industry's unwillingness/inability to offer larger gas tank standard or as an option is unfortunate. Hopefully Ineos will do this. Does anyone know of a North American company that manufactures well-made aux tanks for gas vehicles? I've found a couple custom outfits but tough to find any reviews on performance, quality, etc.