It seems like an 8 cylinder engine should run al 8 all the time. Fuel savings are great but if I wanted a V4 that’s what I’d buy. Even with my 5.3 (I don’t need a lot of power) I think I want all 8 all the time. I get trying to be efficient but something seems odd about taking half the engine out of the equation many times in the course of a 2 mile drive to work.
The power drain is a little concern (I don’t want to keep plugging it in and out) but it seems like a simple (and reversible) way to gain some performance. And let’s be honest, while good economy is nice, or we were that concerned about gas mileage we’d be driving a Civic.