Originally Posted by
Pimp_Daddy_Patty
As for cylinder deactivation. I'm skeptical about how well it works in real life. You still have parts moving and creating parasitic losses. I guess it helps keep the engine in a more efficient load range. That being said, my 94 Ranger had a 2.3L 4 cylinder, a 4.0 V6, and now a 5.0L Turbocharged V8. Most of these combinations have been used with 3.08 and 3.73 gears out back and each engine had a different version of the same transmission behind it. Highway fuel mileage has been 28mph for all engines. I guess you still need a certain amount of energy to keep the vehicle moving regardless of the engine setup.