So a dd roller bases it's engine figure on a 15% transmission loss on a 2wd and 21% on 4wd

wouldn't a fwd car have less tranny losses than a rwd? Due to no prop and a built in diff?

And wouldn't a Subaru style 4x4 have less loss than a Cossie style? Again due to the built in front diff? No seperate front diff n prop.