LM1875 on a single supply

I was reading the datasheet for the LM1875
http://www.national.com/ds.cgi/LM/LM1875.pdf

and I noticed that they do have a schematic for a single supply (as
opposed to a +/- supply).

If running on a single supply, does the chip amplifer consume
significant power during quiet tracks?

Would this be pretty much the same as running the amplifier in Class A
mode (vs. Class AB)?

I'm trying to figure out if I really need a +/- power supply, or if I
can just go with a single supply (easier to build).

Thanks,

Michael