Today, Steve Southworth, the Landmark FBO manager at FDK, agreed to give a $.75 per gallon gasoline discount for PnP missions. The price break does NOT apply to self-service. When you go into the FBO to order fuel, mention you're flying an animal rescue mission and they'll apply the discount. Steve said this takes effect immediately.
I hope there's a way you can get this news passed along to other pilots who volunteer for PnP flights. Also, you might want to encourage other pilots to ask their FBOs if they'd be willing to give a discount, too.