an auto box does not take up anywhere near 30% of the engine power lol, thats far to ineficient. more like 12-18% from what ive read. when we had a dyno day in the UK the net losses for the autos were only about 5% on average lower than the manuals.Its easy to whittle ayway large figures through transmission loss ect to get figures clower to what you want them to be. Wheel BHP is all that counts anyways.