2017 Chevrolet Camaro 1LT lease - is this a good deal?

2017 Chevrolet Camaro 2dr Cpe 1LT Turbo
MSRP: $27290/-
Drive off: $2500 (includes tax, registration, documentation)
36000 miles lease (12k per year)
Monthly payment: $291 + tax
Residual: 56% (is this the correct residual for this model)

Dealer says this is after considering

  1. That I am a costco member ( GM Supplier discount )
  2. Competitive lease pricing (given I already have a lease of a VW jetta!) - this is something new I am hearing, is this even true?

If any of you do know the residuals, money factor and incentives please let me know , it will help me negotiate the deal
Location: 95134
Desired trim level: 1LT
Desired term: 36 months, 12k per year

Thanks in advance