I just measured mine - never knew exactly how much water I was putting in. Anyhow, I put 4 ounces of water in a mug and microwave it for 30 seconds. Then, I draw a double shot on top of it (about 2 1/2 ounces). And if I have a little steamed milk left over from my wife's latte, I put that on top. Voila! A good way to start the day.

Hi there, if i recall my last read of Wikipedia on the subject...

Allonge is a shot that is allowed to run past the usual cutoff of an espresso. No water is added to this drink beyond what comes out of the group. It is hence more bitter since over extracted.

An Americano is a shot to which hot water is added, how much water differs.

If you put hot water in the cup first and then pull the shot on top, that is called something like a long black. It is not technically speaking an americano.

Seems to me that some people had a lot of time to find names for combinations of espresso, water and milk!