Aaa, maybe you get fuel economy 130 MPG because battery on start has -50% charge and maybe engine already hot enough.
I also get readings like this (around 2,5l/100km) sometimes when I starting new trip when engine already at it’s working temperature and battery has more then 30% charge (sorry 3 bars on battery meter) but same 3 bars can be from 25% to 42% charge.
My every day trips is same route with same speed around 40 km/h with maximum speed up to 50km/h, with glide we’re it’s possible after ice engine stopping work to charge battery, I constantly getting readings 3.0l/100km - 3.3l/100km with average on tank for more then 300 km 3,2l/100km, but there is catch - such fuel economy possible when trip not shorter then 8 km in summer or 15-20 km in winter (+10 degrees C) if I starting that trip with cold engine.
First year of car owning i not known that and for several months did relatively short trips ~ 2-3km and my average fuel consumption was 3,8- 4,3l/100km.