My 2 cents worth of experience 
I've got 97 Firestorm/Superhawk with 2004 fuel tank (19 l)
If you look after air filter (must be clean to do good mileage) you looking at 200 km to reserve and 40 on reserve of mixed and sometimes spirited riding .
Vara engine got not so "steep" camshafts, single valve springs and 36mm if I am not wrong intake ports. Storm have whoopinh 48 mm carbs (largest ever on production bike), steep camshafts, double and strong valve springs and as result of it camchain tensioner that serves OK on Vara does not do so well on Storm. Latest generations (FI) of Vara got about 10 less bhp and same peak torque as Storm, but earlier in rpms.
One thing that Vara lacks that Storm have it is precision of trottle at all speeds (apart from different world handling, weight etc.) but Storm is way more thirsty than FI Varadero, way way more and nowhere near as comfortable. On highway well set up Storm never eats more than 6-7 liter per 100 if you do not go over 6000 rpm.
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