RCPilet is correct! The same sized 2 stroke will have more power and usually more torque than the same sized 4 stroke. Only old low power 4 strokes used significantly less fuel. Newer engines may save some fuel, but not much and a few engines may not save any fuel at all. Problem is many people keep comparing larger 4 strokes to smaller 2 strokes. This came out of an old AMA pattern rule which allowed 4 strokes to have 1.5 more displacement than the maximum sized 2 stroke. Guess what the pattern boys switched to 4 strokes because they produced marginly more power than a 2 stroke 2/3's the size. An exception is the YS 4 stroke which produces about the same power (more or less) as the 2 stroke. Also, unless you find a good place to vent the crankcase you will get about the same amount of oil on the plane with a 4-stroke as a 2-stroke.

That said I like both, with an edge to the 2-stroke cause of the lower maintenance.