Jim,
ethanol blends are fairly common in the US now. Here in Portland we have a 10% blend every winter, whether we need it or not (we don't). North of us in Washington, 10% blend is sold year-round at many stations.
I have not had any problems with ethanol blend fuel, and don't expect any. However, ethanol is a good solvent, and if there is a lot of varnish and crud built up in your fuel system, this stuff can be knocked loose and plug up the fuel filter when it's first used. When ethanol was introduced in Portland a few years ago, many people though we were doomed, but this was a problem for only a small percentage of cars.
It might be a good idea to replace the fuel filter after the first few tankfuls, but otherwise should be no problem.
George Davis
'69 280 SL Euro manual