I was talking about mileage efficiency Yes, the 4.6 puts out slightly more HP per liter, but the LS1 still puts out much more power overall than the 4.6, and gets better mileage doing it. What's really pathetic is the 4.0 V6 in the Mustang. 210 horsepower and hardly any better mileage than the 4.6 V8. I rented a brand new 2005 V6 a while back with 550 miles on the clock. Did a couple hundred mostly highway miles on it and it got <20 MPG.