Sorry, but it looks like they got you too. We have been trying to get Forest River to correct the problem with ours (sales brochure for our unit listed 47 gallons for the grey capacity, but when we received the unit they had changed it to 30 gals. In reality it only holds 23 gals. at best), but so far the best they are willing to do is to allow US to pay the dealer to install a second tank. Be careful when you look at the volume stamped on the end of the tank there is a listing for US gallons and Empirical gallons (30/25 in our case). You also may also find that if you do the calcs on the dimensions that it is a bit less than the stamped rating. Seems to me by all the posts here, these folks need to try camping before they make silly changes to these rigs. The last time out we got 3 days dry camping (grey over flowing into the shower) with the four of us, and that was without showers. Guess they should remove the shower since now can’t be used unless you are at a resort. Good luck!