Apa ni, talking about my beloved home country!?
Jkt-Semarang not 24 hrs la, it's almost 500km but yeah still very long around 9-10hrs non stop I think, can be more if got accidents and stuff. I also had not gone there for a very long time. The reason is because the route is mostly normal roads and will pass thru kampung etc2, not all highway like here. So yeah got many stoppages and traffic and much more dangerous too.
Yes, Jkt inner ring toll is a big circle layout around the city and very common to have jams all over. Other non toll roads also got many jams. If no jam then not Jkt, even on weekends! So yes, like I said before, jam in KL is child's play, nothing compared to Jkt. Still a bit worse than Bangkok coz Bangkok now already has MRT. Only cities like Manila or Mumbai can really rival Jkt. All due to poor infra and too big population.
So yeah don't measure FC in Jakarta, it's easily 2-3km/ltr worse in real average. My 4G67 & 4G63 last time only can reach 9km/ltr at best while my 4G93 about 10km/ltr. As for power, well people always want more power but not as important. Having said that though, nobody there want to buy big d-segment cars with just puny underpowered 2.0ltr NA engines like in here!