These are a pretty neat setup, have one in my '83 764 and it allows almost 700 miles cruising. Second tank does block the rear seat pass-through so if you like hauling skis or lumber that is a downside, but the extra capacity is nice. Only other caveat I have experienced - this does add some weight, too, when it is full; long-distance travel with a full load of fuel, full trunk of stuff, and people in the back seat is more than the stock sedan springs are happy handling so if you plan for this kind of use, Nivomats or HD coils or stock wagon springs are worth thinking about as well...
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