they generally have two full gallons when the light comes one ... thats a good 30 miles
I think you can siphon out fuel to "drain" the tank. Maybe take out a couple quarts while attempting to remove any crap floating on the top by letting some air into your siphon tube, run the stuff through a coffee filter to eliminate the large gunk and then put the pre-filtered fuel back in the tank. I've never tried this before, but I think it would work. Obviously if the coffee filter (or whatever you use) disintegrates, you don't want to put that gas back in the truck. Or you could just throw the siphoned fuel away. Anyone see any problems with this? Are there any anti-siphon features in the tank/fill line?Can the tank be drained?