|
If all other things are equal, the newer engines should give you better FE than the older ones. Those "all other things" include vehicle weight, CdA, vehicle size, tire sizes, and so on. Little or none of which actually stays the same over time in automotive design, taking the whole car into account.
But just regarding the engine, in general newer is more efficient than older. And that becomes a more valid comparison if you're talking about engine swaps, where you're examining different engines in one chassis.
Your current Si transmission really sucks for FE. Even if you never go over 70 MPH. (Trust me on this one, I have the same drivetrain in my CRX!) Taller gearing will help your FE. Most engines are more efficient at 2000 RPM than at 3000, and I'd be quite surprised if there were any street car engines that were most efficient at 3500 RPM.
-soD
|