If it's any consolation, they round up when talking liters just like they do with CI.
My Saab is 2.0 liters (actually 1985 cc -- see? Rounding up...), or 121 Cu In, but it's kind of meaningless when you consider 22 psi of boost, then 8.0:1 compression. Displacement becomes less and less of a relavent number. It's more a discussion of volumetric efficiency. If you do the math, at 14.7 psi ambient presure at sea level, plus another 22 psi, we're now at 36.7 psi
actual pressure. You could make the argument that under full boost, the equivalent displacement is something like 302.09 Cu In, or 5.0 liters.
That's why my little 2 liter Swedish motor beats a Mustang 5.0 pretty regularly. However I certainly don't expect it to take on a Goat!
Btw, a great site for metric to SAE conversion, among hundreds of other conversions, can be found here:
http://www.onlineconversion.com/
Jim Miller
'06 M6, 18" rims, Phantom Black, JSP gauge pack, JSP Bluetooth
'02 Saab 9-5 Aero SportWagon 2.3 Turbo
'93 Saab 900 Turbo Commemorative Edition #116 of 325, modified
'91 Saab 900 Turbo Special Edition, restored