Dumbest question ever asked!

For consumers engine sizes in liters (usualy advertised with one decimal) or cui is entirely irrelevant and for gearheads most with half a functioning brain can figure out the approximate size conversion just as easy as approximating how much you will pay at the grocery store before the cashier even gives you the numbers, if you need a correct numbers you cant trust the factory enginename anyway and will just have to calculate actual displacement by bore and stroke and get a real volume in as many decimals as you want to.