Ok guys, on the Porsche site, it says the Carrerra GT's V10 makes 605hp w/ 5.7 litres. They also state that the engine makes 105.5hp/litre. [Obviously, they estimated some numbers- 605/5.7 does not exactly equal 105.5]. Anyways, the S2000 makes 240hp w/ a little less than 2 litres. Estimating, the S2000 makes 120hp/litre [240/2]. Is this hp/litre comparison an accurate way to determine engine efficiency? Is it safe to say that the f20c is more efficient than that.....that beast?