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I also found this on a wiki article about variable displacement:
In typical light-load driving the driver uses only around 30 percent of an engine’s maximum power. In these conditions, the throttle valve is nearly closed, and the engine needs to work to draw air. This causes an inefficiency known as pumping loss. Some large capacity engines need to be throttled so much at light load that the cylinder pressure at top dead centre is approximately half that of a small 4-cylinder engine. Low cylinder pressure means low fuel efficiency.
I can't imagine that this would have a really significant effect, so much as friction inside the cylinders would. I always try to keep my RPMs low, and my throttle position low. I avoid higher than 3,000 RPM and try to keep my TPS less than 19(starts at 10, goes to 90) while cruising. Im going to do some significant research on engine load, and what exactly it means, but thanks to all who replied, it did help.
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