On my 2014 Plus 8 all the evidence suggests 55L is accurate.
When the warning light comes on (yes, I know.....) the tank will take 50L to fill up.
Reserve is supposed to be 5L
For reasons that cannot be properly explained the gauges, both analogue and digital, are accurate. They start to be confused by gradient/speed at about 20%, but otherwise they read as predictably as in my BMW or Caroline's Merc.
All very strange.
