The "commentariat" charge is legitimate, which is why there is a field known as "mathematics" which is unambiguous. 1.6x by anybody's non-commentariat definition is 60% faster, as anybody who has ever even scratched the surface of any mathematical, engineering, scientific, statistical or indeed, computer science discipline knows (though this is perhaps unknown to the Creative Suite crowd). This comment is completely bogus, with apologies if you don't understand. But you really should know what you don't know before posting such garbage.
Also you're wrong. "__ faster" implies addition in many/most cases. Since you know what 1.6x is by itself, I'll let you use your math knowledge to calculate x + 1.6x.