It continues to amaze me how “veteran” forum members will take more time responding to a brand new members question by sending them elsewhere when it would take them less time to just give them the answer/information they’re looking for. Perhaps the OP didn’t realize the answer or previous models/years of brochures could be found on the GW website, hence why he asked the question? I admittedly didn’t realize that either when I first joined the forum here, as I’m guessing most probably don’t. To RI Adventure, the answer to your question is that the original fuel tank had a capacity of 82 gallons, per the GW website. Welcome aboard, ask as many questions as you’d like since we don’t have a ton of traffic on here or anything, a whopping 10 posts spanning 6 threads for the entirety of the day yesterday in the “General Discussion” part of the forum… if my math is correct.