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I've had a couple Cadillac rentals lately they use variable displacement, the CTX got a easy 32 MPG cruising at 70 to 75. The Northstar line is the followup to the failed V8/6/4 from back in the day..
They don't shut down 4 cyl or any cylinders really, they strategically skip the injector pulse in a order calculated to skip each cylinder in a manner to not un-balance the power cycle of the engine. This means that at cruise and no load it can effectively be only firing only part of the cylinders, I've heard the caddy will EOC itself on a downhill run. Its still spining but under highly reduced load. I think it even opens the torque converter lockup when coasting.
Dave
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