I dropped mine off this morning for TPMS issue and asked my sales guy. He said no less than 90% of MSRP. Could be as much as 95% depending on options and miles.The L494's are still very rare here in NJ. My dealer only has RRSs that were ordered by customers, i.e. all are spoken-for. Online, I see used 2014's being sold by dealers for almost the same price as a new 2015.
I think you will lose less than 10% trading to a dealer. If you sell private, then I think you could be close to breaking even (w/o tax&title).