Originally posted by Nildo
Ok that is a really good point. Anybody can compare stats to get the answer they want. As I said, many cars aren't available in all markets. I've never heard of most of the ones you mention.

There is one really small nit I'd like to pick though. When you say a smaller engine can be more efficient due to airflow you are right. But when it comes to piston speed that is more relative to actual capacity per cylinder and bore/stroke ratios. Which is why I can't get the v10 viper motor when a 12 would be inherently more efficient.
Sorry to take so long to get back to you, this thread is messy.

You are right about the V-12 of the same displacement being more effcient. Maybe for more torque? Having a longer deeper stroke usually produces a flatter torque line. I have never really questioned it. Thanx