I've had 3 'Burbs over the years (all 70's models). I think 2 of them had the 40-gal. tank. It was fine as long as I had gas, but I always hated the "sticker shock" whenever I pulled in to fill that puppy up!

All of mine were 4WD, but the real gas hog of the bunch had full-time 4wd. I practically had to take out a 2nd mortgage to keep gas in that beast!