I'm trying to work out the effective value of a GPU. I'm sure this has been done before, but as the words cash, value and GPU are short, it's not letting me search.

Anyhow, I see the value for 2015 as $1818 (the value of 20,000 miles with a 1K 11x multiplier) + $500 (co-pay for W class) = $2318

Can anyone agree or come up with a different value?