I've just bought an Archer II with a 140 hr factory overhauled engine, so it's probably running as well as one can expect.
If you don't lean it in the cruise, expect 38-40 lph. If you lean it and cruise at 3,500ft on 2350 rpm, you can expect 32 lph.
If I flew higher, I might do better, but this is the SE of England we're talking about....!