Range?...well I can only say it ranges if you'll excuse the pun.
The 4 has a huge speed range and that makes a single figure impossible to quote.
Firstly it depends on what engine is fitted. Second it depends how you fly.
I often fly with a friend in formation with his Jodel ( YouTube..Jodel Flyer ) at that speed of around 100 knts indicated I am at about 1650 rpm and leaned. If I am in a headwind of say 18 knts my fuel burn is very low but my progress is slow at approx 80 knts.
On my own and bimbling I fly faster than that because it's more comfortable, let's say 125/130 knts economic cruise. The headwind then has less overall effect but as a tailwind I am now going places !
Ok so now if I really open it up I can cruise at VNE quite easily in mine and that enables me to punch into a hefty head wind ( less time getting somewhere equals more range in terms of more gph for less time ).
However if I pick up a tailwind I have seen groundspeeds in excess of 250 mph. Ok high fuel burn but getting places much quicker effectively giving greater range.
I have a 3 blade Cartoon cruise pitch on my 4 it will exceed VNE in level flight. (I thoroughly recommend this prop.)
So you see the range varies far more than you average LAA type and you can get extra fuel tankage relatively easy. Two types of bolt on tanks are available that don't require any modifications to the wing. One system is a clever idea it is effectively a long tube that slides into the holes in the wing ribs and the other type replaces the wing tips. Common in the USA but I don't know of any in the UK however it shouldn't be much fuss getting a mod approved over here based on the record" over there ".