I bought a 2000 golf with an ALH back in December and so far I've been happy enough with it. Doesn't see WMO but I do add 1/2-1 gallon of WATF to a tank. Reds the fuel a smidge and no noticeable side effects yet. If you figure the 45-50mpg it already gets plus one free gallon to a tank that puts it in the 55-60 mpg range that you pay for.
My methodology Makes sense to me