Brian,
I think you are right that aluminium tanks on this side of the world don't really get any coating in them. My guess is that the reason for this not being the case in Europe, compared to the US, is the ethanol contect in our fuels. The ethanol content of fuel in some states of the US is quite high, and this will attack the aluminium. However, over here this is only starting. They made quite a fuss about our 95RON in Belgium, because since last year it containts 10% ethanol. So I could do this to prevent any trouble in future, but am not quite sure about it.
Serge
I think the corrosion aspect could make a debate all on it's own, there seems to be a wide range of views between "Armageddon" and "nothing to see here". I get the corrosion aspect with Ethanol but it's also temperature dependent and inhibited by water content which I haven't seen as widely quoted.
I've had steel petrol tanks corrode internally due to moisture content as the tank breathes so I suspect my Al tanks aren't going to have a problem because you only need 50ppm of water to inhibit. And I'll bet the tanks see that even during our tropical English summers.....
If you were running a sealed system with anhydrous conditions then it could well be different, in which case I'd look for the water content in typical fuels. If this (ethanol corrosion) becomes a large scale problem then I'd expect the fuel companies to be including 100 ppm in their spec because there are a lot of cars out there with aluminium alloys in the fuel delivery system.
This isn't something I know much about, so if you find anything new I'd be interested in your research.