No reason to really disagree here. Vado SL would not meet the criteria for L1e-B in the EU anyway.
I have always looked at battery range estimates as marketing figures. Specialized says an 80 kg rider with a decent leg power. The range depends on so many factors the advertised figures should be taken with a pinch of salt.
Now, I have found the outcome of an SL Turbo test ride 8 months post my Vado SL 4.0 EQ purchase. I rode using two Range Extenders one after another. As the test results show, each Range Extender was good for 18.5 km (11.5 mi) so both would be good for 37 km or 23 mi. The fact I could ride for 41.2 km (25.6 mi) was only possible because the Main Battery contributed with 8% of the charge extra.
View attachment 184229
A derestricted e-bike data. A loop ride. The max speed was achieved with tailwind. Low ambient temperature. A 95 kg rider, no cargo. Almost flat.
@GAJ got 25 miles (40 km) so it only proves his riding conditions (and he himself as a rider) were different. Now, if we only look theoretically on the matter, the 520 Wh battery is 1.625x of the 320 Wh one.
If we take my results, the SL 1.2/520 Wh range should be 37.4 mi or 60.2 km. Specialized says 37 miles (60 km). I think it is doable.