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I would say that pretty much any kind of lean burn or egr strategy would be better than a cylinder delete.
I'd rather play with flame speed and a cushion of egr than play with an imbalanced 2cyl engine. I've never known the math, let alone forget.... But 4cyl's are naturally imbalanced due to power stroke degrees of rotation. You would have to run two cylinders rich or near stoic, so you may eliminate some throttling losses or something, but with a turbo, I don't think that's a big enough factor.
I ran my Ford on an Atkinson cycle, it worked. And it still wasn't worth pursuing.
I think a megasquirt and a couple months of research on timing and flame speed would yield better results than a cyl delete. Plus..... A tune can cruise at an illegally lean AFR, and still produce 200hp at wot. A 2 cyl jetta will just be an unreliable piece of garbage worth an extra 5mpg MAYBE! Plus, with a solid tune, you don't need to hypermile, you've just gotta watch your egt's and you're good!
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