The 918 is unpurchaseable, but you can walk into any Porsche dealer and buy a 911 Turbo S for ~$190k that'll do 0-60 in 2.5s.

We're picking nits, so I'm going to point out that Porsche claims the 911 Turbo S that they sell today does 0-60 in 2.8s, slower than you're suggesting.

I don't have firsthand knowledge to be able to say which of you is wrong.

Porsche is conservative with their reported 0-60 numbers. People that have tested it are able to get 2.5s. Look at the first two columns of times in the table here:

https://en.wikipedia.org/wiki/List_of_fastest_production_car...

Rollout can account for 0.1 or 0.2 of a second, and that table kind of hand-waves it away: "Some measurements exclude the first foot-rollout."